Question

intro bibloteca sint 1000 de carti ,in prima bibloteca sint cu 125 mai putie de cit in a doua si in a  doua si a treia sint 625 cite carti sint in fie care 

Answer 1

a+b+c=1000
a+625=1000
a=1000-625
a=375
b=a+125
b=375+125
b=500
500+c=625
c=625-500
c=125

375+500+125=1000

Answer 2

A = B - 125
B + C = 625   ⇒ C = 625 - B
A + B + C = 1000
B - 125 + B + 625 - B = 1000
B = 1000 - 500
B = 500 CARTI
A = 500 - 125
A = 375 CARTI
C = 625 - 500
C = 125 CARTI