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# OK first of all, sorry of the such a topic name i choose.

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Manager
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OK first of all, sorry of the such a topic name i choose. [#permalink]  06 Nov 2009, 07:09
00:00

Question Stats:

75% (01:28) correct 25% (02:28) wrong based on 4 sessions
OK first of all, sorry of the such a topic name i choose.
The reason is, i average around 45-47 in mock tests, if I list out the error i make during the mocks 99% of it will be from DS and 1 or max two will be from other.
If the same question is re-framed in a normal way i can solve it or if i take more time. But i feel something is missing in DS for me.Most of my quant score is taking a hit form DS. Any suggestions?

and apologies for the wrong tag also, ( may be it makes sense coz this for sure is 700+ question)
Manager
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Re: data insufficient!! [#permalink]  06 Nov 2009, 07:27
this problem seems to be easy,

If the units digit of the three-digit positive integer k is nonzero, what is the tens digit of k?
(1) The tens digit of k + 9 is 3.
(2) The tens digit of k + 4 is 2.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient

but sadly i got it wrong
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Re: data insufficient!! [#permalink]  06 Nov 2009, 08:23
1
KUDOS
kirankp wrote:
this problem seems to be easy,

If the units digit of the three-digit positive integer k is nonzero, what is the tens digit of k?
(1) The tens digit of k + 9 is 3.
(2) The tens digit of k + 4 is 2.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient

but sadly i got it wrong

Q45-47 sounds great to me

A for this one?
XYZ. Z is not zero. What is Y?

A. Adding 9 will take 1 carry over (z>=1). So Y is 3-1=2. Sufficient.
B. Adding 4 may or may not carry over. So Y maybe 2 or 1. Not sufficient.
Manager
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Re: data insufficient!! [#permalink]  06 Nov 2009, 08:39
AHHHHHHh, man i made a mistake here, why why why me ..

the way i saw it was .... xyz, with y+9 = 3 that is 10th place + 9... AHHHHHHHHHHHHHHHHH
thanks dude
appreciate the help
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Re: data insufficient!! [#permalink]  05 May 2011, 22:07
a 130 is the only number which could have toppled the choice.But since units digit can't be 0, hence 130 is not possible.
thus tens digit has to be 2 with numbers starting from 121.

thus a
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Re: data insufficient!! [#permalink]  07 May 2011, 17:08
1. Sufficient

we know the units digit is not 0 and we are adding 9 to it. so this will for sure result in a carry over to tens digit.

=> after carry over the tens digit = 3. => before it was 2.

2. Not sufficient

this may or may not result in a carry over to the tens digit.

units digit 0 to 5 , no carry over
units digit 6 to 9 , carry over

Re: data insufficient!!   [#permalink] 07 May 2011, 17:08
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