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The ratio of ages of Aman, Bren, and Charlie

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The ratio of ages of Aman, Bren, and Charlie  [#permalink]

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New post 25 Feb 2016, 05:00
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

77% (01:30) correct 23% (02:09) wrong based on 85 sessions

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The ratio of ages of Aman, Bren, and Charlie are in the ratio 5:8:7 respectively. If 8 years ago, the sum of their ages was 76, what will be the age of Aman 10 years from now?
A) 17
B) 25
C) 27
D) 35
E) 40




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Re: The ratio of ages of Aman, Bren, and Charlie  [#permalink]

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New post 26 Feb 2016, 01:09
Answer = D

Let the present ages of Aman, Bren, and Charlie be 5x, 8x and 7x respectively.

5x-8 + 8x-8 + 7x-8 = 76

x = 5

Present age of Aman = 5*5 = 25

Aman's age 10 years hence = 25+10 = 35
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Re: The ratio of ages of Aman, Bren, and Charlie  [#permalink]

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New post 26 Feb 2016, 05:12
chetan2u wrote:
The ratio of ages of Aman, Bren, and Charlie are in the ratio 5:8:7 respectively. If 8 years ago, the sum of their ages was 76, what will be the age of Aman 10 years from now?
A) 17
B) 25
C) 27
D) 35
E) 40



OA in three days
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Assume the ages to be 5x, 7x and 8x

Sum of ages 8 years ago = 5x + 7x + 8x - 24 = 76
20x = 100
x = 5

Current age of Aman = 25
Age 10 years from now = 25 + 10 = 35
Option D
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Re: The ratio of ages of Aman, Bren, and Charlie  [#permalink]

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New post 26 Feb 2016, 12:06
The approaches above look good to me. To avoid error, I'd also do two things up front:

1) Write down "5x + 10 = ___." This way, I'm less likely fall for the trap answer lurking in B.

2) Eliminate A and C. Only B, D, and E fit my predicted answer of 10 more than a multiple of 5. (If Aman's age is a multiple of 5 now, it can't be 7 or 17.)
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Re: The ratio of ages of Aman, Bren, and Charlie   [#permalink] 26 Feb 2016, 12:06
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