Question

Va rog ajutatima. Mihai a cheltuit o suma de bani in doua zile. In prima zi a cheltuit 30% din suma,iar in a doua zi restul de 35 de lei. Calculatii suma de bani cheltuita de Mihai in prima zi.

Answer 1

x=suma de bani avuta
a= suma cheltuita in prima zi
b=suma cheltuita in a doua zi=35

a=x30/100
x-x30/100=35 Aducem la acelasi numitor
100x-30x=3500 => 70x=3500 => x=50
a=50*30/100 => a=1500/100 => a=15

Answer 2

30/100•S + 35 = S
30s/100 -100s/100 = -35
-70s/100= -35 |•(-1)
70s/100 = 35
7/10 • S = 35
s = 35 • 10/7
s = 50 lei