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If a and b are positive integers so that the remainder, when dividing

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If a and b are positive integers so that the remainder, when dividing  [#permalink]

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New post 06 Feb 2018, 10:30
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If a and b are positive integers so that the remainder, when dividing a by b is 4. Which of the following could be the value of a/b?

a)3/4

b) 1/3

c) 5/8

d) 5/7

e) 7/8


Source: ExamPAL

Kudos for detailed explanation!

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If a and b are positive integers so that the remainder, when dividing  [#permalink]

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New post 06 Feb 2018, 12:37
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Teerex wrote:
If a and b are positive integers so that the remainder, when dividing a by b is 4. Which of the following could be the value of a/b?

a)3/4

b) 1/3

c) 5/8

d) 5/7

e) 7/8


Source: ExamPAL

Kudos for detailed explanation!



This is the method that I used to solve this problem
We need the fraction a/b such that we get remainder as 4.

Evaluate the various answer options available
a) 3x/4x
When x=1, remainder of 3
When x=2, remainder of 6
When x=3, remainder of 9
When x=4, remainder of 12
b) x/3x
When x=1, remainder of 1
When x=2, remainder of 2
When x=3, remainder of 3
When x=4, remainder of 4

Hence, Option B(1/3) could be the value of the expression (a/b)
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Re: If a and b are positive integers so that the remainder, when dividing  [#permalink]

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New post 06 Feb 2018, 23:42
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pushpitkc wrote:
Teerex wrote:
If a and b are positive integers so that the remainder, when dividing a by b is 4. Which of the following could be the value of a/b?

a)3/4

b) 1/3

c) 5/8

d) 5/7

e) 7/8


Source: ExamPAL

Kudos for detailed explanation!



This is ExamPAL's solution:
Since all the answers are smaller than 1, a must be smaller than b. So a must be the remainder itself.
so, 4/b=fraction such that b is an integer.
Checking this:
Option A: 4/b=3/4 => b=16/3 (incorrect as b is not an integer)
Option B: 4/b=1/3 =>b=12 (Correct as b is an integer)

So, B is the correct answer!

I thought the solution is really cool coz I didn't think like that at all! Hope you like it :D
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Re: If a and b are positive integers so that the remainder, when dividing  [#permalink]

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New post 07 Feb 2018, 04:37
Teerex wrote:
If a and b are positive integers so that the remainder, when dividing a by b is 4. Which of the following could be the value of a/b?

a)3/4

b) 1/3

c) 5/8

d) 5/7

e) 7/8


Source: ExamPAL

Kudos for detailed explanation!


As per the question -

\(a - 4 = bq\), which means as a & b are positive integers, a value will always be greater than or equal to 4.
Lets take \(a = 5, bq = 1 (a>b)\)
\(a = 6, bq = 2 (a > b).\)
But as per the options a < b. So, the only value possible for \(a = 4, bq = 0\) (here, \(q = 0\) as b is positive integer)
As \(a = 4\), to make \(a < b, b = 4k\) (Where \(k = 2,3,4,5,6,7,8.....\) etc).
Only Option is \(\frac{4}{12} = \frac{1}{3}\)
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If a and b are positive integers so that the remainder, when dividing  [#permalink]

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New post Updated on: 11 Mar 2018, 18:21
Teerex wrote:
If a and b are positive integers so that the remainder, when dividing a by b is 4. Which of the following could be the value of a/b?

a)3/4

b) 1/3

c) 5/8

d) 5/7

e) 7/8


let q=quotient
a=bq+4
assume b>a
then q=0 and a=4
only 4/b=1/3 makes b an integer
4/12=1/3
B

Originally posted by gracie on 07 Feb 2018, 14:05.
Last edited by gracie on 11 Mar 2018, 18:21, edited 1 time in total.
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If a and b are positive integers so that the remainder, when dividing  [#permalink]

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New post 07 Feb 2018, 20:25
1
Teerex wrote:
If a and b are positive integers so that the remainder, when dividing a by b is 4. Which of the following could be the value of a/b?

a)3/4

b) 1/3

c) 5/8

d) 5/7

e) 7/8


Source: ExamPAL

Kudos for detailed explanation!



Hi....

All the choices are in simplest form with denominator>numerator..
So the REMAINDER will be MULTIPLE of numerator..
All other except A and B have a numerator>4, so none of the C, D and E can have a Remainder of 4..
A has 3 in numerator so the Remainder will be 3,6,9...
4 is not a MULTIPLE of 3, so A out
Ans B.
and a and b are 4 and 12..

Note:- choices should have been in increasing/decreasing order.
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: If a and b are positive integers so that the remainder, when dividing  [#permalink]

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New post 09 Feb 2018, 10:56
Teerex wrote:
If a and b are positive integers so that the remainder, when dividing a by b is 4. Which of the following could be the value of a/b?

a)3/4

b) 1/3

c) 5/8

d) 5/7

e) 7/8



Scanning the answer choices, we observe that all the choices are proper fractions. This means that b is greater than a, which in turn implies that the remainder from the division of a by b is in fact a. Therefore, a = 4.

We note that for any answer choice besides 1/3, it is not possible to obtain an equivalent fraction where the numerator is 4. Since 1/3 = 4/12, the remainder when dividing 4 by 12 is 4.

Answer: B
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Re: If a and b are positive integers so that the remainder, when dividing  [#permalink]

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New post 12 Mar 2018, 08:50
Mathematically, a=kb+4 where k=0,1,2,.....

so, a/b = k+4/b .. hence a/b has to be greater than 1 for all values of k except 0. For k=0, a=4.
Hence the numerator must be a multiple of 4. Hence, B.

Hope this makes sense.

Tx.
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Re: If a and b are positive integers so that the remainder, when dividing &nbs [#permalink] 12 Mar 2018, 08:50
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