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C
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Difficulty:
15%
(low)
Question Stats:
83% (01:06) correct
17%
(01:15)
wrong
based on 65
sessions
History
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In 12 years, Murray will be 4 times as old as he is now. The number of years until Murray is 8 times as old as he is now?
A. 16
B. 20
C. 28
D. 32
E. 44
A. 16
B. 20
C. 28
D. 32
E. 44
25 Oct 2019, 11:25
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If increasing his age by 12 increases his age by a factor of 4, so by 300%, then 12 is 300% of his current age, and his current age is 4. So in 28 years, when he'll be 32, he'll be 8 times as old as he is now, and the answer is C.
You could also create the equation - if A is his current age, then the stem tells us:
A + 12 = 4A
and solving that we learn A = 4, from which we can get the answer as above.
You could also create the equation - if A is his current age, then the stem tells us:
A + 12 = 4A
and solving that we learn A = 4, from which we can get the answer as above.
24 Feb 2020, 07:46
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hudacse6
In 12 years, Murray will be 4 times as old as he is now. The number of years until Murray is 8 times as old as he is now?
A. 16
B. 20
C. 28
D. 32
E. 44
A. 16
B. 20
C. 28
D. 32
E. 44
Let x = Murray's PRESENT age
In 12 years, Murray will be 4 times as old as he is now
In 12 years, Murray's age = x + 12
So we can write: x + 12 = 4x
Solve to get: x = 4
So Murray is presently 4 years old
The number of years until Murray is 8 times as old as he is now?
(8)(4) = 32
So the question is really asking us,"How many years will it take until Murray is 32 years old?"
32 - 4 = 28
Answer: C
Cheers,
Brent
