Question

Find
16. A man is thrice as old as his son. Five years ago the man was four times as old as his son.
their present ages.
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Answer 1

Answer:

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Step-by-step explanation:

Let the age of son be x

Let his father's age be 3x

Five years ago, age of son = x - 5

Five years ago, age of father = 3x - 5

5 years ago the man was four times as old as his son = 4(x - 5)

According to the question,

3x - 5 = 4(x - 5)

3x - 5 = 4x - 20

3x - 4x = -20 + 5

\cancel{-}

−

x = \cancel{-}

−

15

x = 15

Present age of son is x

=> 15 years

Present age of father =. 3x

=> 3 * 15

=> 45 years

∴ The age of son and his father is 15 years and 45 years respectively.