Question

O firma are 120 de angajati.Determinati numarul barbatilor angajati in firma, stiind ca numarul femeilor reprezinta 20% din numarul barbatilor

Answer 1

f+b=120
f=$\frac{20b}{100}$
$\frac{20b}{100} +b=120$ -aducem la acelasi numitor peste tot.
$\frac{20b}{100} + \frac{100b}{100} = \frac{12000}{100}$
20b+100b=12000
120b=12000
b=12000/120
b=100

Answer 2

f+b=120
f=$\frac{20b}{100}$
20b+100b=12000
120b=12000
b=12000/120
b=100