Question

Irina, Teodor si Andrei au partcipat la un concurs.Irina si Teodor au obtu impea 559 puncte,Teodor si Andrei au impreuna 600 de puncte,iar Irina si Ande531 puncte.catepucte a obtinu fiecare copil

Answer 1

I-Irina t-Teodor a-Andrei
I+t=559
t+a=600
I+a=531
adunam cele 3 relatii
2*l+2*t+2*a=1690
impartim relatia la 2
l+t+a=845
l+t=559 =>a=845-559=286
t+a=600 =>t+286=600 =>t=600-286=314
l+a=531 =>l+286=531=>l=531-286=245