SOLUTION: Mr. Abu is now three times as old as his son Kofi. if the sum of their ages 8 years ago was 48, find the boy's present age.

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Question 1101343: Mr. Abu is now three times as old as his son Kofi. if the sum of their ages 8 years ago was 48, find the boy's present age.

Found 3 solutions by stanbon, josmiceli, richwmiller:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Mr. Abu is now three times as old as his son Kofi. if the sum of their ages 8 years ago was 48, find the boy's present age.
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A = 3k
A-8 + k-8 = 48
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Substitute for A and solve for "k":
3k-8 + 3k-8 = 48
6k = 66
Ans:: k = 11 yrs (son's age now)
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Cheers,
Stan H.
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Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +a+ = Mr Abu's age now
Let +b+ = Kofi's age now
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(1) +a+=+3b+
(2) +%28+a+-+8+%29+%2B+%28+b+-+8+%29+=+48+
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(2) +a+%2B+b+-+16+=+48+
(2) +a+%2B+b+=+64+
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Substitute (1) into (2)
(2) +3b+%2B+b+=+64+
(2) +4b+=+64+
(2) +b+=+16+
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Kofi's age is presently 16
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check:
(1) +a+=+3%2A16+
(1) +a+=+48+
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(2) +%28+a+-+8+%29+%2B+%28+b+-+8+%29+=+48+
(2) +%28+48+-+8+%29+%2B+%28+16+-+8+%29+=+48+
(2) +40+%2B+8+=+48+
(2) +48+=+48+
OK

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Stan is not having a good day.
Substitute for A and solve for "k":
3k-8 + 3k-8 = 48
should be
3k-8 + k-8 = 48
4k = 48+16
4k= 64
k = 16 yrs (Kofi's age now)