Question

Dupa o scumpire de 10%,o ciocalata costa 1,65 lei.Cat costa inainte de scumpire?

Answer 1

[100+10]/100 ·x=165/100
⇒110/100 ·x=165/100
⇒x=165/100 ·100/110
⇒x=165/110
⇒x=1,5[lei-pretul inainte de scumpire];

Answer 2

$x- \frac{10}{100} *x=1,65 \\ \frac{100x}{100} + \frac{10x}{100} =1,65 \\ \frac{110x}{100} =1,65 \\ 110x=1,65*100 \\ 110x=165 \\ x= \frac{165}{110} \\ x=1,5$