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The present age of son is half the present age of his father.10 years ago the father was thrice as old as his son.find their present age.

Répondre :

father = f

son = s

The present age of son is half the present age of his father

s = 0,5 x f

10 years ago the father was thrice as old as his son.

f-10 = 3(s-10)

i replace s by "0,5xf"

f - 10 = 3 (0,5f - 10)

f - 10 = 1,5f - 30

0,5f = 20

f = 40

=> father = 40 and son = 20

10 years ago

f = 30 et s = 10 (f = 3x10) ok

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