Question

Intr-o livada s-au plantat 450 de pomi.In primele doua zile s-au plantat 340,iar in ultimele doua zile,210 pomi.Cati pomi s-au plantat in a doua zi?

Answer 1

a + b + c = 450
a + b = 340
b + c = 210
a = 450 - 210
a = 240
b = 340 - 240
b = 100
c =  210 - 100
c = 110

Answer 2

Notam prima zi=a;a doa zi=b;a treia zi=c
a+b+c=450
a+b=340
c=450-340
c=110 a treia zi
b+c=210
b+110=210
b=210-110
b=100 a doua zi