17. a
a + b + c = 6256
a + b = 3428
___________(-)
c = 6256 - 3428
c = 2828
c = b + 1122
b = c - 1122 = 2828 - 1122
b = 1706
a+b = 3428
a = 3428 - b
a = 3428 - 1706
a = 1722
18. b
1 cutie rosie
3 cutii verzi
3*4 cutii galbene
_______________(+)
Total = 1 + 3 + 3*4 = 16 cutii
