Question

Gigel,Misu si Sandu au impreuna 74 de lei. -eu am 15 lei in plus fata de Gigel!spune Misu vesel . -eu am 13 lei minus fata de Gigel!zice Sandu abatut. Cati lei are fiecare dintre cei 3 baieti?

Answer 1

g + m + s = 74 
m= g+15  ⇒ m= 24+15= 39 lei
s= g-13 ⇒ s= 24-13 = 11 lei
g+g+15+g-13= 74 
3g+2=74  
3g= 72 
g=72/3 
g= 24

Answer 2

G I______I
M I______I....15....I
S I___I..13I    total 74 de lei

egalam partile 74-15+13=72
nr partilor egale 1+1+1=3
Cati lei are Gigel ? 72:3=24
Cati lei are Misu?  24+15=39 lei
Cati lei are Sandu? 24-13=11 lei
verificare 24+39+11=74 lei