Question

trei elevi au de rezolvat 240 probleme.aflati cat au rezolvat fiecare daca primul a rezolvat cat ceilalti doi impreuna ,iar al doilea cu 10 mai mult decat al treilea

Answer 1

a+b+c=240 probleme
a =b+c=>a=c+10+c=>a=2c+10
b=c+10
2c+10+c+10+c=240 probleme
4c+20=240 probleme
4c=240-20=>4c=220=>c=220/4=>c=55 probleme
b=c+10=>b=55+10=>b=65 probleme
a=2c+10=>a=55*2+10=>a=110*2=220