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Dovator [93]
3 years ago
6

Anul acesta varsta tatalui este de 4 ori mai mare decat a fiului,dar peste 20 de ani va fi de 2 ori mai mare.Cati an va avea fiu

l peste 5 ani.
Mathematics
1 answer:
Xelga [282]3 years ago
3 0
T = varsta tatalui
f = varsta fiului

anul acesta: t = 4 x f
peste 20 de ani: t+20 = 2 x (f+20)

=> 4 x f +20 = 2 x f + 2 x 20
4 x f - 2 x f = 2 x 20 - 20
2 x f = 20
f = 10
anul acesta fiul are 10 ani
peste 5 ani fiul va avea...
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