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If x, y, and z are threedigit positive integers and if x = [#permalink]
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18 Sep 2012, 09:10
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If x, y, and z are threedigit positive integers and if x = y + z, is the hundreds digit of x equal to the sum of the hundreds digits of y and z ? (1) The tens digit of x is equal to the sum of the tens digits of y and z. (2) The units digit of x is equal to the sum of the units digits of y and z. Is it safe to conclude that the place value of an integer number (represented as a sum of different integers), depends upon only the preceding place value of integers being summed up?
for eg: x=1000a+100b+10c+1d y=1000e+100f+10g+1h z=1000l+100m+10n+1p if z=x+y then
is l only dependent upon value of b and f or some other parameters also??
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Last edited by Bunuel on 18 Sep 2012, 09:16, edited 1 time in total.
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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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18 Sep 2012, 11:04
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conty911 wrote: If x, y, and z are threedigit positive integers and if x = y + z, is the hundreds digit of x equal to the sum of the hundreds digits of y and z ? (1) The tens digit of x is equal to the sum of the tens digits of y and z. (2) The units digit of x is equal to the sum of the units digits of y and z. Is it safe to conclude that the place value of an integer number (represented as a sum of different integers), depends upon only the preceding place value of integers being summed up?
for eg: x=1000a+100b+10c+1d y=1000e+100f+10g+1h z=1000l+100m+10n+1p if z=x+y then
is l only dependent upon value of b and f or some other parameters also?? Question is demanding 100 digit of Y + 100 digit of Z is equal to 100 digit of X, means there will not be any carryover from the sum of tens digit of Y and Z. therefore from Option 1, sum of tens digit of Y and Z equal to of X means there will not be any carryforward from here to 100 digit of Y and Z. therefore option 1 is sufficient to answer. Option 2 unit digit sum is equal, will not give any indication whether tens digit will not carryforward any to hundered. therefore this is not sufficient. ANswer "A"



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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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18 Sep 2012, 11:06
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Let x= a b c y = d e f z= g h i x= y+z 1 > b= e+h which in turn implies c=f+i and so a=d+g (and this implies there is no carry forward in the addition of units and tens place digit of the two numbers) 2> c=f+i which does not tell us if b= e+h(as there could be a carry forward bcos of this addition to the hundred place) and so the answer is A
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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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18 Sep 2012, 21:13
The concern here is the sum of the tenth digit might have a carryover, so the sum of the hundredth digit on Y & Z might not be equal to X's hundredth digit. So A is the right answer.



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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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20 Sep 2012, 00:12
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x = ABC y = DEF z = GHI DEF +GHI _____ ABC Question: Is D + G = A? This is true if there is no carryover from the tens digits' sum. 1. E + H = B, This means there is no carry over to hundreds position. SUFFICIENT. 2. C + F = I, This means there is no carry over to tens position BUT we do not know if there will be a carry over during the sum of tens. INSUFFICIENT. Answer: A
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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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14 Jan 2013, 02:52
abhishekkpv wrote: Let x= a b c y = d e f z= g h i
x= y+z
1 > b= e+h which in turn implies c=f+i and so a=d+g (and this implies there is no carry forward in the addition of units and tens place digit of the two numbers)
2> c=f+i which does not tell us if b= e+h(as there could be a carry forward bcos of this addition to the hundred place)
and so the answer is A so this is sort of a number property?
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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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23 Feb 2013, 03:18
Let the 3 digit numbers be, x=ABC y=DEF z=GHI Now, its given that DEF + GHI _____ ABC _____ Statement 1 says that E+H=B. Substitute any digit for E and H, you will find that D+G must be equal to A. Sufficient Statement2.......says F+I=C. E and H can be anything and in turn D and G can be anything. Not sufficient.
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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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13 Apr 2013, 11:23
abhishekkpv wrote: Let x= a b c y = d e f z= g h i
x= y+z
1 > b= e+h which in turn implies c=f+i and so a=d+g (and this implies there is no carry forward in the addition of units and tens place digit of the two numbers)
2> c=f+i which does not tell us if b= e+h(as there could be a carry forward bcos of this addition to the hundred place)
and so the answer is A my confusion is the following regarding (1). maybe i am not reading the question right, but assume the following: y: 6 4 3 z: 4 4 2 x: 1 0 8 5 so, the tens digit of x is equal to the sum of the tens digit of y + z. however, the hundreds digit, 6 + 4 = 1 0. The hundreds digit of x would be 0. can someone please explain? thank you



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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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13 Apr 2013, 11:27
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mokura wrote: my confusion is the following regarding (1). maybe i am not reading the question right, but assume the following: y: 6 4 3 z: 4 4 2 x: 1 0 8 5 so, the tens digit of x is equal to the sum of the tens digit of y + z. however, the hundreds digit, 6 + 4 = 1 0. The hundreds digit of x would be 0. can someone please explain? thank you Your problem is very simple : "x, y, and z are threedigit positive integers". x cannot be 1085, it must be \(\leq{999}\) P.S: welcome to GmatClub!
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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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13 Apr 2013, 11:29
Zarrolou wrote: mokura wrote: my confusion is the following regarding (1). maybe i am not reading the question right, but assume the following: y: 6 4 3 z: 4 4 2 x: 1 0 8 5 so, the tens digit of x is equal to the sum of the tens digit of y + z. however, the hundreds digit, 6 + 4 = 1 0. The hundreds digit of x would be 0. can someone please explain? thank you Your problem is very simple : "x, y, and z are threedigit positive integers". x cannot be 1085, it must be \(\leq{999}\) P.S: welcome to GmatClub! ouffff thanks so much for the quick reply and clarification. should reread the question next time



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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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21 Aug 2013, 06:14
Is there an alternative approach for this problem?
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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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21 Aug 2013, 07:45
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fozzzy wrote: If x, y, and z are threedigit positive integers and if x = y + z, is the hundreds digit of x equal to the sum of the hundreds digits of y and z ?
(1) The tens digit of x is equal to the sum of the tens digits of y and z. (2) The units digit of x is equal to the sum of the units digits of y and z.
Is there an alternative approach for this problem? The question basically asks whether there is a carry over 1 from the tens place to the hundreds place. Consider the following examples: (i) 123 234357 Here when we add the tens digits 2 and 3 there is no carry over 1 from the tens place to the hundreds place, thus the hundreds digit of x (3) is equal to the sum of the hundreds digits of y (1) and z (2). (ii) 153 147300 Here when we add the tens digits 5 and 4 and carry over 1 from the units place, we get 10, so we have carry over 1 from the tens place to the hundreds place, thus the hundreds digit of x (3) does NOT equal to the sum of the hundreds digits of y (1) and z (1). The first statement implies that there is no carry over 1 from the tens place to the hundreds place, thus the hundreds digit of x is equal to the sum of the hundreds digits of y and z. Sufficient. The second statement does not provide us with sufficient information about carry over 1 from the tens place to the hundreds place. Answer: A. Hope it's clear.
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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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19 Jan 2014, 10:16
For Statement I my problem pertains to the fact that the ten's digit of x will be expressed as ten's digit of y + ten's digit of z. But if y=190 ,z=190 then x =380 the 1 does carry over from the ten's digit. Although the ten's digit of x is the sum of ten's digit of y and z.
Please Elaborate



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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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19 Jan 2014, 10:28



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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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19 Jan 2014, 10:35
Ah. Got it now thanks
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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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15 Dec 2014, 16:57
Hi Guys,
I thought statement #1 can't be correct alone because (I thought) we must know that BOTH the unit & the tens digits do not carry over:
i.e.
153 147 300
vs
152 147 299
Don't we need to know that both to confirm that the hundreds digit is a 3 rather than 2?



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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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16 Dec 2014, 04:23



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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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17 Dec 2014, 05:18
Bunuel wrote: Abheek wrote: For Statement I my problem pertains to the fact that the ten's digit of x will be expressed as ten's digit of y + ten's digit of z. But if y=190 ,z=190 then x =380 the 1 does carry over from the ten's digit. Although the ten's digit of x is the sum of ten's digit of y and z.
Please Elaborate The tens digit of y is 9 and the tens digit of z is 9 > 9+9=18 not 8. Hope it's clear. Can you please clarify this. I am not sure why the carry over of 1 will not happen.



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If x, y, and z are threedigit positive integers and if x = [#permalink]
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17 Dec 2014, 05:35
Bunuel wrote: ColdSushi wrote: Hi Guys,
I thought statement #1 can't be correct alone because (I thought) we must know that BOTH the unit & the tens digits do not carry over:
i.e.
153 147 300
vs
152 147 299
Don't we need to know that both to confirm that the hundreds digit is a 3 rather than 2? But in your second example there IS a carry over 1 from the tens place to the hundreds place. No? Ok let me clarify my question: 153 147300 In this case the hundreds digit became 3 because the unit total 10 > carries 1 to the tens digit > tens digit adds to 10, so carries 1 to the hundreds digit. The hundreds digit thus = 3 vs 152 147299 In this case the hundreds digit remains 2 because the unit total didn't exceed 9 > nothing carries over to the tens digit (i.e. tens digit remains 9), The hundreds digit thus = remains 2 So don't we need to know the unit digit AND the tens digit to confirm whether the hundreds digit will remain 2 or pushed to 3? (I'm not sure why I'm just not getting it!!)



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Re: If x, y, and z are threedigit positive integers and if x = [#permalink]
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17 Dec 2014, 06:14
ColdSushi wrote: Bunuel wrote: ColdSushi wrote: Hi Guys,
I thought statement #1 can't be correct alone because (I thought) we must know that BOTH the unit & the tens digits do not carry over:
i.e.
153 147 300
vs
152 147 299
Don't we need to know that both to confirm that the hundreds digit is a 3 rather than 2? But in your second example there IS a carry over 1 from the tens place to the hundreds place. No? Ok let me clarify my question: 153 147300 In this case the hundreds digit became 3 because the unit total 10 > carries 1 to the tens digit > tens digit adds to 10, so carries 1 to the hundreds digit. The hundreds digit thus = 3 vs 152 147299 In this case the hundreds digit remains 2 because the unit total didn't exceed 9 > nothing carries over to the tens digit (i.e. tens digit remains 9), The hundreds digit thus = remains 2 So don't we need to know the unit digit AND the tens digit to confirm whether the hundreds digit will remain 2 or pushed to 3? (I'm not sure why I'm just not getting it!!) Your first example does NOT satisfy the first statement: the tens digit of x is equal to the sum of the tens digits of y and z. So, it'as not valid. Sorry, cannot explanation any better.
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