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When positive integer x is divided by 7 the quotient is q

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When positive integer x is divided by 7 the quotient is q [#permalink]

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When positive integer x is divided by 7 the quotient is q and the remainder is 1. What is the remainder when x is divided by 10?

(1) When x is divided by 5 the quotient is q and the remainder is 1
(2) x is less than 50

-----------------------------
I got the correct answer but took quite a while. I listed out all the possible value of x and realize remainder when x is divided by 10 has to be 1. Any other faster method?

8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85
6, 11, 16, 21, 26, 31, 36, 41, 46, 56, 61, 71
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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 19 Nov 2013, 03:56
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from the ques stem we know-
x= 7q + 1
from 1) x = 5q + 1
subtracting we get x =1. hence when we divide x i.e. 1 by 10 we get remainder 1. sufficient.
stmt 2 is clearly insufficient. lots of possible values for x.

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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 19 Nov 2013, 08:29
zerosleep wrote:
from the ques stem we know-
x= 7q + 1
from 1) x = 5q + 1
subtracting we get x =1. hence when we divide x i.e. 1 by 10 we get remainder 1. sufficient.
stmt 2 is clearly insufficient. lots of possible values for x.


What do you mean? Subtracting we get x = 1 ?

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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 19 Nov 2013, 10:11
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zerosleep wrote:
from the ques stem we know-
x= 7q + 1
from 1) x = 5q + 1
subtracting we get x =1. hence when we divide x i.e. 1 by 10 we get remainder 1. sufficient.
stmt 2 is clearly insufficient. lots of possible values for x.


You don't get x=1 when you subract, you'd get 0=2q....also when you divide 1 by 10 the remainder is 10..

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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 19 Nov 2013, 11:20
N=7q+1
N=5q+1

Therefore: N=35X +1

The remeinder could be 1 or 6. for Example if X=0 then the remeinder is 1, but when X=1 then the remeinder is 6.

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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 20 Nov 2013, 00:16
bluecatie1 wrote:
N=7q+1
N=5q+1

Therefore: N=35X +1

The remeinder could be 1 or 6. for Example if X=0 then the remeinder is 1, but when X=1 then the remeinder is 6.



Precisely what i thought but from Question stem and St 1 we have
but note that it is for the same value of q that we get the remainder 1

x= 7q+1 and x=5q+1 -------> For the same value of q

Also 7q+1=5q+1 --------> 2Q=0 or q=0

Thus the number is 1 and when divided by 10 the remainder is 1 only.

Ans A is correct

if the Question would have stated x= 7q+1 and x=5a+1 then x= 35C+1 and possible value of x = 1,36,71, 106,141.....

then even taking statement 2 the answer would be E. The Question stem needs to mention that x is a 2 digit number.

Hope it helps :)
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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 20 Nov 2013, 00:21
registerincog wrote:
When positive integer x is divided by 7 the quotient is q and the remainder is 1. What is the remainder when x is divided by 10?

(1) When x is divided by 5 the quotient is q and the remainder is 1
(2) x is less than 50

-----------------------------
I got the correct answer but took quite a while. I listed out all the possible value of x and realize remainder when x is divided by 10 has to be 1. Any other faster method?

8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85
6, 11, 16, 21, 26, 31, 36, 41, 46, 56, 61, 71



For the 2 values highlighted in bold, the remainders will be 6 and 1 respectively.

You need to consider 1 as well the possible value of x....here's why

x=7q+1 when q=0, x=1
q=1,x=8

Similarly x =5q+1, q=0, x=1
q=2,,x=6....and so on
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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 20 Nov 2013, 00:31
registerincog wrote:
When positive integer x is divided by 7 the quotient is q and the remainder is 1. What is the remainder when x is divided by 10?

(1) When x is divided by 5 the quotient is q and the remainder is 1
(2) x is less than 50



From the question stem, x =7q+1.

F.S 1 states that x = 5q+1. Thus, we know that 7q+1=5q+1 --> q=0.Note that q is also an integer. Thus, x=1.Remainder when 1 is divided by 10 is 1. Sufficient.

F.S 2 for x=8, remainder when divided by 10 is 8.However, when x=15,the remainder when x is divided by 10 is 5. 2 different numerical values, hence Insufficient.

A.

AccipiterQ wrote:
when you divide 1 by 10 the remainder is 10..


Nope . This is incorrect.
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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 20 Nov 2013, 06:08
AccipiterQ wrote:
zerosleep wrote:
from the ques stem we know-
x= 7q + 1
from 1) x = 5q + 1
subtracting we get x =1. hence when we divide x i.e. 1 by 10 we get remainder 1. sufficient.
stmt 2 is clearly insufficient. lots of possible values for x.


You don't get x=1 when you subract, you'd get 0=2q....also when you divide 1 by 10 the remainder is 10..



Hi,

I meant if you subtract these equations you get q =0. Now put q =0 in any equation and you will get x =1. Hence the no is 1. Now when you divide x (which is 1) by 10, you will get remainder 1. Sorry for the confusion.

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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 20 Nov 2013, 06:10
registerincog wrote:
zerosleep wrote:
from the ques stem we know-
x= 7q + 1
from 1) x = 5q + 1
subtracting we get x =1. hence when we divide x i.e. 1 by 10 we get remainder 1. sufficient.
stmt 2 is clearly insufficient. lots of possible values for x.


What do you mean? Subtracting we get x = 1 ?


Hi,
Full solution to avoid any confusion-
x= 7q + 1
from 1) x = 5q + 1
Now subtracting these two equations yields q =0. Now put q=0 in any equation and you will get x=1. hence the no is 1. Now if we divide x (which is nothing but 1) we will remainder as 1.

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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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Stmt 1 made it so simple that I assumed there must be typo in the question and solved with x=5p+1 and got C as the answer :oops:

if x = 7q+1 and x=5q+1 only value that q can take is ZERO!!! How can stmt 1 be so simple :evil:
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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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Hi,
IMO C. Please correct me if I am wrong.

from stmt 1: x = 7q+1 and x=5q+1 which leads to .. x=35Q+36 as the general formula.
hence multiple values of x will satisfy this. 36, 71, 106 .. you cannot say if the remainder will be 1 or 6.

from stmt2 x < 50 .. not sufficient.

from stmt1 and stmt 2 .. x can be only 36. Hence C.
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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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seabhi wrote:
Hi,
IMO C. Please correct me if I am wrong.

from stmt 1: x = 7q+1 and x=5q+1 which leads to .. x=35Q+36 as the general formula.
hence multiple values of x will satisfy this. 36, 71, 106 .. you cannot say if the remainder will be 1 or 6.

from stmt2 x < 50 .. not sufficient.

from stmt1 and stmt 2 .. x can be only 36. Hence C.


No, the correct answer is A.

When positive integer x is divided by 7 the quotient is q and the remainder is 1. What is the remainder when x is divided by 10?

When positive integer x is divided by 7 the quotient is q and the remainder is 1 --> x = 7q + 1 --> x could be 1, 8, 15, 22, ...

(1) When x is divided by 5 the quotient is q and the remainder is 1 --> x = 5q + 1 --> subtract this from the equation from the stem: 0 = 2q --> q = 0 --> x = 1. 1 divided by 10 gives the remainder of 1. Sufficient.

(2) x is less than 50 --> if x = 1, then the remainder upon division 1 by 10 is 1 but if x = 8, then the remainder upon division 8 by 10 is 8. Not sufficient.

Answer: A.

Hope it helps.
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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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x= 7q + 1
from 1) x = 5q + 1
subtracting eqn 1 from given, we get x =1. hence when we divide x i.e. 1 by 10 we get remainder 1. Sufficient.
stmt 2 is clearly insufficient.
Hence, A

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Re: When positive integer x is divided by 7 the quotient is q [#permalink]

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New post 08 Aug 2017, 21:26
Bunuel wrote:
seabhi wrote:
Hi,
IMO C. Please correct me if I am wrong.

from stmt 1: x = 7q+1 and x=5q+1 which leads to .. x=35Q+36 as the general formula.
hence multiple values of x will satisfy this. 36, 71, 106 .. you cannot say if the remainder will be 1 or 6.

from stmt2 x < 50 .. not sufficient.

from stmt1 and stmt 2 .. x can be only 36. Hence C.


No, the correct answer is A.

When positive integer x is divided by 7 the quotient is q and the remainder is 1. What is the remainder when x is divided by 10?

When positive integer x is divided by 7 the quotient is q and the remainder is 1 --> x = 7q + 1 --> x could be 1, 8, 15, 22, ...

(1) When x is divided by 5 the quotient is q and the remainder is 1 --> x = 5q + 1 --> subtract this from the equation from the stem: 0 = 2q --> q = 0 --> x = 1. 1 divided by 10 gives the remainder of 1. Sufficient.

(2) x is less than 50 --> if x = 1, then the remainder upon division 1 by 10 is 1 but if x = 8, then the remainder upon division 8 by 10 is 8. Not sufficient.

Answer: A.

Hope it helps.


Bunuel the method you mentioned in response to seabhi has been discussed above. i'm curious -- if he's wrong, how were his calculations incorrect? i built out the #s given from the formulas and got the same thing as him (see below):

- x=5q+1, so: 6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66, 71
- x = 7q+1, so: 8, 15, 22, 29, 36, 43, 50, 57, 64, 71

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Re: When positive integer x is divided by 7 the quotient is q   [#permalink] 08 Aug 2017, 21:26
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