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If in k+1 years from now John will be m years old, then how

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If in k+1 years from now John will be m years old, then how

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Economist GMAT

If in k+1 years from now John will be m years old, then how old was John t-1 years ago?

A. m-k-t
B. m+k-t+2
C. m+k-t+1
D. k-m-t+2
E. k+t-m

OA A.

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AAPL wrote:
Economist GMAT

If in k+1 years from now John will be m years old, then how old was John t-1 years ago?

A. m-k-t
B. m+k-t+2
C. m+k-t+1
D. k-m-t+2
E. k+t-m
In k+1 years from now John will be m years old
So, m - (k + 1) = John's PRESENT age

How old was John t-1 years ago?
So, m - (k + 1) - (t - 1) = John's age (t-1) YEARS AGO

Simplify m - (k + 1) - (t - 1) to get: m - k - t

Answer: A

Cheers,
Brent

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Post
AAPL wrote:
Economist GMAT

If in k+1 years from now John will be m years old, then how old was John t-1 years ago?

A. m-k-t
B. m+k-t+2
C. m+k-t+1
D. k-m-t+2
E. k+t-m
We can let J = John’s current age, and we have:

J + k + 1 = m

J = m - k - 1

Thus, t - 1 years ago John was J - (t - 1) = m - k - 1 - t + 1 = m - k - t years old.

Answer: A

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Scott Woodbury-Stewart Founder and CEO

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