Question

Daca x/15=42\35,atunci x=?

Answer 1

x = 15 · 42/ 35 = 3 · 42  / 7 = 6 ·3 =18 

Answer 2

$\displaystyle \frac{x}{15} = \frac{42}{35} \Rightarrow 35x=15 \cdot 42 \Rightarrow 35x=630 \Rightarrow x= \frac{630}{35} \Rightarrow x=18$