Question

mihai a cheltuit o suma de bani in doua zile.in prima zi mihai a cheltuit 30%din suma,iar in a doua zi restul de 35 de lei.calculati suma de bani cheltuita de mihai in prima zi

Answer 1

s- suma
s-30s/100=35  / 100
100s-30s=3500
70s=3500
s=3500:70
s=50 lei initial 
el a cheltuit 30%
adica 50*30/100=
1500/100=15 lei

Answer 2

30%din S +35 lei=S.......#0 supra 100 S +3500=100 S ............30 S-100 S=-3500.....S=50...in prima zi 30 supra 100 x50=15 lei prima zi