Mathematics
JAMB 1979
A father is now three times as old as his son. Twelve years ago he was six times as old as his son. How old are the son and the father?
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A.
20 and 45
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B.
100 and 150
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C.
45 and 65
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D.
35 and 75
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E.
20 and 60
Correct Answer: Option E
Explanation
Son = x, Father = 3x, 12 yrs ago
son = x - 12, father = 3x - 12
3x - 12 = 6(x - 12)
3x - 12 = 6x - 72
3x = 60
x = 20
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