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C/D = 9.75 When dividing positive integer C by positive

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C/D = 9.75 When dividing positive integer C by positive [#permalink]

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New post 05 Aug 2014, 11:31
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C/D = 9.75
When dividing positive integer C by positive integer D, the remainder is 3. Which of the following could be the value of C?

A. 39
B. 37
C. 36
D. 31
E. 30
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C/D = 9.75 When dividing positive integer C by positive [#permalink]

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New post Updated on: 06 Aug 2014, 04:20
1
goodyear2013 wrote:
C/D = 9.75
When dividing positive integer C by positive integer D, the remainder is 3. Which of the following could be the value of C?

A. 39
B. 37
C. 36
D. 31
E. 30


Isn't the statement C/D=9.75 sufficient?

\(\frac{C}{D}=9.75\) <=> \(\frac{C}{D}=9+\frac{3}{4}\) <=> \(C=D(9+\frac{3}{4})\) <=>\(C=D(\frac{39}{4})\)
D is a positive integer so if \(D = 4\) then \(C=39\).
Answer A

Edit : Nevermind, just realized my reasoning is flawed.

Originally posted by oss198 on 05 Aug 2014, 11:56.
Last edited by oss198 on 06 Aug 2014, 04:20, edited 1 time in total.
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Re: C/D = 9.75 When dividing positive integer C by positive [#permalink]

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New post 06 Aug 2014, 01:24
2
goodyear2013 wrote:
C/D = 9.75
When dividing positive integer C by positive integer D, the remainder is 3. Which of the following could be the value of C?

A. 39
B. 37
C. 36
D. 31
E. 30


\(\frac{C}{D} = 9.75 = \frac{975}{100}\)

Divide numerator/ denominator by 25

\(= \frac{39}{4}\) which gives remainder of 3

Answer = A
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Re: C/D = 9.75 When dividing positive integer C by positive [#permalink]

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New post 20 Jul 2015, 04:15
goodyear2013 wrote:
C/D = 9.75
When dividing positive integer C by positive integer D, the remainder is 3. Which of the following could be the value of C?

A. 39
B. 37
C. 36
D. 31
E. 30


Bunuel

Could you check this? If we divide 31/4 we also have a remainder of 3. Therefore this question has two correct answers (A and D).

Thanks
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Re: C/D = 9.75 When dividing positive integer C by positive [#permalink]

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New post 20 Jul 2015, 04:27
3
reto wrote:
goodyear2013 wrote:
C/D = 9.75
When dividing positive integer C by positive integer D, the remainder is 3. Which of the following could be the value of C?

A. 39
B. 37
C. 36
D. 31
E. 30


Bunuel

Could you check this? If we divide 31/4 we also have a remainder of 3. Therefore this question has two correct answers (A and D).

Thanks


31/4 = 7.75, not 9.75.
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Re: C/D = 9.75 When dividing positive integer C by positive [#permalink]

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New post 20 Jul 2015, 04:41
goodyear2013 wrote:
C/D = 9.75
When dividing positive integer C by positive integer D, the remainder is 3. Which of the following could be the value of C?

A. 39
B. 37
C. 36
D. 31
E. 30


CONCEPT: Decimal part x Divisor = Remainder

0.75 D = 3
i.e. D = 4

Now Divisible part of C by D as divisor = 9*D = 9*4 = 36

i.e. The Number C = 36+3 = 39

Answer: Option A
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Re: C/D = 9.75 When dividing positive integer C by positive [#permalink]

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New post 10 May 2018, 10:44
goodyear2013 wrote:
C/D = 9.75
When dividing positive integer C by positive integer D, the remainder is 3. Which of the following could be the value of C?

A. 39
B. 37
C. 36
D. 31
E. 30



Simplifying the equation we have:

C/D = 9 + 0.75

C/D = 9 + 75/100

C/D = 9 + 3/4

We can also say that:

C/D = Q + 3/D

Since 3/4 = 3/D, we see that D = 4.

Thus, we see that C/4 = 9.75, so C = 4 x 9.75 = 39.

Answer: A
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Re: C/D = 9.75 When dividing positive integer C by positive   [#permalink] 10 May 2018, 10:44
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C/D = 9.75 When dividing positive integer C by positive

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