If x and y are positive integers such that x/y=33.375,

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If x and y are positive integers such that x/y=33.375, [#permalink]

07 May 2012, 17:24

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If x and y are positive integers such that x/y=33.375, which of the following could be the remainder when x is divided by y?

A. 8
B. 21
C. 25
D. 44
E. 47

I assumed that the remainder would be a number "b" where b / y = 0.375. But didn't know how to proceed.
Thanks!

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Re: f x and y are positive integers such that x / y = 33.375, wh [#permalink]

07 May 2012, 21:38

IMO B

You are correct upto b/y, where b is the remainder..

0.375 can be represented as 3/8, so in our case, b must be the multiple of 3.. from the options given, only B(21) matches this criteria, hence B is the answer

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Re: f x and y are positive integers such that x / y = 33.375, wh [#permalink]

07 May 2012, 21:47

The answer is B - 21 because 21/0.375 yields an integer (= 56) and none of the other options does

x/y = Integer + Remainder
=> x/y = 33 + 0.375

Multiplying both sides by 56,
56(x/y) = 56*33 + 21

ALTERNATIVELY,you may calculate as follows:
x/y = 33.375
=> x/y = 33375/1000 = 267/8 = (33*8 + 3)/8

Multiply both sides by 7 to get
x/y = (33*56 + 21)/8 which can be written as 33*56/8 + 21/8

Once we know that we can get 3 as a remainder, we can select the answer choice that is a multiple of 3 (21 in this case)

The answer is therefore choice (B)
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Re: If x and y are positive integers such that x/y=33.375, [#permalink]

08 May 2012, 00:36

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alexpavlos wrote:

x divided by y yields the remainder of r can always be expressed as: \frac{x}{y}=q+\frac{r}{y} (which is the same as x=qy+r), where q is the quotient and r is the remainder.

\frac{x}{y}=33.375=33\frac{375}{1,000}=33\frac{3}{8}=33+\frac{3}{8}, so according to the above \frac{r}{y}=\frac{3}{8}, which means that r must be a multiple of 3. Only option B offers answer which is a multiple of 3.

Answer: B.

Hope it's clear.
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Re: If x and y are positive integers such that x/y=33.375, [#permalink]

08 May 2012, 10:01

x/y=33.375 or x/y=33 + 375/1000

remainder/y=375/1000=5*5*5*3/5*5*5*2*2*2=3/8
R/y=3/8
8R=3y

so, ur remainder must be divisible by 3. only answer choice B is divisible by 3.
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Re: If x and y are positive integers such that x/y=33.375, [#permalink]

09 May 2012, 15:05

alexpavlos wrote:

x/y=33.375
x = 33y + 0.375y

quotient (q) = 33
reminder (r) = 0.375y

Since x and y are positive integers, quotient and reminder are always integers or whole numbers. Then, r must be one of these whole numbers from the answer choices. We need to find which one of these answer choices is divisible by 0.375.
r = 0.375y
r = 3y/8

A. If r = 8, 3y/8 = 8, y = 64/3
B. If r = 21, 3y/8 = 21, y = 56
C. If r = 25, 3y/8 = 25, y = 200/3
D. If r = 44, 3y/8 = 44, y = 353/3
E. If r = 47, 3y/8 = 47, y = 376/3

So only, B has integer value/whole number. So its B.

Re: If x and y are positive integers such that x/y=33.375, [#permalink] 09 May 2012, 15:05

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If x and y are positive integers such that x/y=33.375,

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