Răspuns :
30[la suta]+35lei=100[la suta]
⇒70/100 ·y=35[lei]
⇒y=35/70/100
⇒y=35·100/70
⇒y=35·10/7
⇒y=5·10
⇒y=50[lei-suma totala de bani];
⇒70/100 ·y=35[lei]
⇒y=35/70/100
⇒y=35·100/70
⇒y=35·10/7
⇒y=5·10
⇒y=50[lei-suma totala de bani];
s- suma
s-30s/100= 35 /*100
100s-30s=3500
70s=3500
s=50 de lei a avut toti banii
El a cheltuit 30%
30*50/100=1500/100=15 lei a cheltuit
s-30s/100= 35 /*100
100s-30s=3500
70s=3500
s=50 de lei a avut toti banii
El a cheltuit 30%
30*50/100=1500/100=15 lei a cheltuit