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Mo, Jo si Flo impart intre ei o anumita suma de bani. Mo primeste 5/8, Jo primeste 0,25 si Flo primeste 7,50 lei. Care era suma totala?

Răspuns :

5/8x
0,25+7.50+5/8x=x
7.75=8x/8-5x/8
7.75=3x/8
775/100=3x/8
300x=775x8
x=20.6 lei
5/8+0,25+7,50=5/8+25/100+75/100=5/8 se amplifica cu 100,iar celelalte două cu8 si obti 500/100+200/100+600/100=1300/100=13 lei