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10 years ago, John was thrice as old as Jimmy. Fifteen years since

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10 years ago, John was thrice as old as Jimmy. Fifteen years since  [#permalink]

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New post 18 Jan 2019, 07:51
1
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

80% (02:22) correct 20% (01:48) wrong based on 11 sessions

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10 years ago, John was thrice as old as Jimmy. Fifteen years hence, John will be 4/3 times as old as Jimmy. What is the sum of their ages today?

A. 10

B. 33

C. 30

D. 40

E. 44

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Re: 10 years ago, John was thrice as old as Jimmy. Fifteen years since  [#permalink]

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New post 18 Jan 2019, 07:58
fitzpratik wrote:
10 years ago, John was thrice as old as Jimmy. Fifteen years hence, John will be 4/3 times as old as Jimmy. What is the sum of their ages today?

A. 10

B. 33

C. 30

D. 40

E. 44


Say 10 yrs ago, Jimmy was M yrs old. Then 10 yrs ago, John's age was 3M.

After 25 years (10 previous yrs + 15 future yrs), Jimmy will be M + 25 and John will be 3M + 25

Given: (3M + 25) = (4/3)*(M + 25)

9M + 75 = 4M + 100
M = 5
3M = 15
Sum of their ages 10 yrs ago was 5+15 = 20
Sum of their present ages = 20+10+10 = 40

Answer (D)
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Re: 10 years ago, John was thrice as old as Jimmy. Fifteen years since  [#permalink]

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New post 18 Jan 2019, 20:46
What is the question source? Use of 'hence' is awkward.
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Re: 10 years ago, John was thrice as old as Jimmy. Fifteen years since   [#permalink] 18 Jan 2019, 20:46
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10 years ago, John was thrice as old as Jimmy. Fifteen years since

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