Question

Daca 60% din 80% dintr-un numar este egal cu 96,atunci valoarea numarului este egala cu:
A.180 B.200 C.240 D.270

Answer 1

x *80%*60%=96
x *4/5 *3/5 =96
12x/25=96
x=96*25/12
x=200
raspuns corect B)

Answer 2

$x *80\%*60\%=96 \\ x* \frac{80}{100}* \frac{60}{100}=96 \\ \\ \frac{80}{100}(simplific~cu~20)= \frac{4}{5} \\ \\ \frac{60}{100}(simplific~cu~20)= \frac{3}{5} \\ \\ x* \frac{4}{5} * \frac{3}{5}=96 \\ \\ \frac{4*3*x}{5*5}=96 \\ \\ \frac{12x}{25}=96 \\ \\ x=96* \frac{25}{12} \\ \\ x= \frac{96*25}{12} \\ \\ x= \frac{2400}{12} \\ \\ x=200 \\ Varianta~corecta = \ \textgreater \ B)$