Notam cu:
a=cantitatea de prune vanduta in prima zi
b=cantitatea de prune vanduta in a doua zi
c=cantitatea de prune vanduta in a treia zi
a+b+c=150
2×a=b-6 si 2×a=c:3
a=? b=? c=?
Rezolvare
a|___| +6
b|___|___|__| }150
c|___|___|___|___|___|___|
9 p.e.+6=150
9 p.e.=144
144:9=16(o p.e/a/cantitatea de prune vanduta in prima zi)
16×2+6=38(b/cantitatea de prune vanduta in a doua zi)
16×6=96(c/cantitatea de prune vanduta in a treia z)
R:16,38,96
