Question

Mama,tata si fratele meu castiga intr-o luna 5888 de lei.Cat castiga fiecare ,daca mama si tata castiga impreuna 4388 de lei,iar tatal si fratele castiga impreuna 4000 de lei ? Va rog daca se poate intrebarile problemei.

Answer 1

m+t+f=5888
m+t=4388
=>f=5888-4388=1500 lei
t+f=4000=>t+1500=4000
=>t=4000-1500=2500
m+t+f=5888=>m+2500+1500=5888=>m=5888-4000=1888 lei.

Answer 2

M-mama,..T-tata..,F-fratele
M+T+F=5888
M+T=4388
T+F=4000⇒F=4000-T
1)Cat castiga tata?
M+T+F=5888
4388+4000-T=5888
8388-T=5888⇒T=8388-5888⇒T=2500lei
2)Cat castiga mama?
M+T=4388
M+2500=4388⇒M=4388-2500⇒M=1888lei
3)Cat castiga fratele?
T+F=4000
2500+F=4000⇒F=4000-2500⇒F=1500lei

verificare:  1888+2500+1500=5888lei    A