Question

Determinati x , y , z stiind că:
x pe 2 = y pe 11 = z pe 7 şi x+y+z = 80

Answer 1

$\it\dfrac{x}{2}=\dfrac{y}{11}=\dfrac{z}{7}=\dfrac{x+y+z}{2+11+7}=\dfrac{80}{20}=4$

$\it\dfrac{x}{2}=4 \Rightarrow x =8$

$\it\dfrac{y}{11}=4 \Rightarrow y =44$

$\it\dfrac{z}{7}=4 \Rightarrow z =28\ .$