a). 60 hl + 50 hl = 110 hl
b). 2.100 hl + 120 hl + 450 hl = 2.670 hl
c). 60 hl + 50 hl + 80 hl = 190 hl ( in primele 3 luni vanduti )
450 hl - 190 hl = 260 hl ( cu 260 hl )
d). 50 hl + 80 hl = 130 hl ( februarie si martie )
2.100 hl = aprilie
2.100- 130=1.970 hl ( cu atat )