Răspunsuri

2014-04-17T11:40:06+03:00
X=numar zile
y=numar exercitii
3*y=x
4*(y-5)=x
Egalam:
3*y=4*(y-5)
3*y=4*y-20
-y=-20 =>y=20 exercitii
x=3*y=3*20=60  zile