Question

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

Answer 1

f+b=120, f= 20/100•b=1/5•b=b/5, inlocuim si obtinem b/5+b=120, amplificam b cu 5 si avem b/5+5b/5=120, 6b/5=120, 6b=120•5, 6b=600, b=100.

Answer 2

$x+y=120$
$x= \frac{20y}{100} = \frac{y}{5}$
$\frac{y}{5} +x=120$
$\frac{(y+5y)}{5} =120$
$\frac{6b}{5} =120$
$y=120* \frac{5}{6}$
$y=100$
$x= \frac{y}{5}$
$x= \frac{100}{5}$
$x=20$
Raspuns: Numarul barbatilor=100.