Đáp án:
Đáp án:
$\frac{y}{40}$ = $\frac{36}{26}$
$\frac{z}{y}$ = $\frac{25}{20}$
=> $\frac{y}{40}$ x $\frac{z}{y}$ = $\frac{36}{26}$ x $\frac{25}{20}$
<=> $\frac{z}{40}$ = $\frac{45}{26}$
$\frac{x}{z}$ = $\frac{65}{100}$
=> $\frac{z}{40}$ x $\frac{x}{z}$ = $\frac{45}{26}$ x $\frac{65}{100}$
<=> $\frac{x}{40}$ = $\frac{9}{8}$
=> x = $\frac{9}{8}$ x 40 = 45
