Question

O firma are 120 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=120-100
f=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