Question

dupa o reducere 10% pretul unui obiect a devenit 54 lei,cat era pretul initial?

Answer 1

a-10:100 x a = 54
100:100 a -10:100 a = 54
a x (100-10 ) :100 = 54
a x 90:100 = 54
a x 9:10 =54
9a = 10 x 54
9a = 540
a = 540 : 9
a= 60