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=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

f=100/5=20

Answer 2

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

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

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

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