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.
Mathématiques
5bprishtikhadka
Question
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.
1 Réponse
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1. Réponse Anonyme
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