a)Caise=100%-(20%+60%+15%)
=100%-95%
=5%
b)60 t_________100%
x___________ 20%
x=12 t pere
60 t__________100%
y___________ 60%
y=36 t mere
60 t___________100%
z____________ 15%
z=9 t prune
=>caise sunt 60-(12+36+9)=60-57=3 t caise
c)12 t pere __________ 100%
9 t prune _________ p%
p%=900/12=75% din cantit. de pere reprezinta cantitatea de prune