Question

Determinati un numar rational,stiind ca 2/5 din el marit cu 30%din el da acelasi rezultat ca atunci cand scadem din numar 1/5

Answer 1

$\frac{2x}{5}+\frac{30x}{100}=x-\frac{1}{5}$

$\frac{7x}{10}=\frac{5x-1}{5}$

$10(5x-1)=35x$

$50x-10=35x$

$50x-35x=10$

$15x=10$

$x=\frac{10}{15}=\frac{2}{3}$