Question

sabendo-se que x+y+z=160, e que x,y,z são respectivamente, proporcionais a 2,3, e 5, determine a razão xy/z

Answer 1

$2+3+5=10\\\\\frac{2}{10}=\frac{x}{160}\\\\x=32\\\\\frac{3}{10}=\frac{y}{160}\\\\y=48\\\\z=80\\\\\frac{xy}{z}=\frac{32\cdot48}{80}=19.2$