(a +b+c):3=9/5
a+b+c=27/5
2. 4x1 + 10x1,5= 4+ 15=19
19 lei : 14 caiete = 1,35 lei un caiet
4.a+b+c=17/36
a+b=7/12 (amplificam cu 3)
a+b=21/36 si a+b+c=17/36 de aici 21/36 +c=17/36
c= -4/36
5.(a+b+c):3= (37x3 +1)/3
a+b+c=112
c=b+44, (b+c):2=54
(b+b+44):2=54
2b+44=108
b=64:2
b=32
c=32+44=76
(a+76+32):3=112/3
a+76+32=112
a+108=112
a=4