Bunuel wrote:
If John is x years old now, and his father is 44 years old now, in how many years will John’s father be twice as old as John will be at that time?
A. 44 – 2x
B. 44 – x
C. 44
D. 2x
E. x – 22
PS21252
GIVEN:
x = John's PRESENT age
44 = the father's PRESENT age
Let k = the number of years it will take until John's father is TWICE as old as JohnSo....
x +
k = John's age IN k YEARS
44 +
k = the father's IN k YEARS
In k years, we want the father's age to be twice John's age
In other words we want: 44 +
k = (2)(x +
k)
Expand to get: 44 + k = 2x + 2k
Subtract k from both sides to get: 44 = 2x + k
Subtract 2x from both sides to get:
44 - 2x = kIn other words, in
44 - 2x years, the father's age will be twice John's age
Answer: A
Cheers,
Brent
_________________
Brent Hanneson – Creator of gmatprepnow.com
I’ve spent the last 20 years helping students overcome their difficulties with GMAT math, and the biggest thing I’ve learned is…
Many students fail to maximize their quant score NOT because they lack the skills to solve certain questions but because they don’t understand what the GMAT is truly testing -
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