Question

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

Answer 1

f+b=120

f=20% din b=  20/100* b=  1/5 * b=  b/5

b/5 + b=120  aducem la acelasi numitor

b+5b=600
6b=600
b=100

a=120-100
a=20

Answer 2

notam cu f=femei
b=barbati
f+b=120

f=20% x b= $\frac{20}{100}$=  $\frac{1}{5}$ * b= $\frac{b}{5}$

$\frac{b}{5}$ +b =120  
b+5b=600
6b=600
b=100

f=$\frac{100}{5}$=20