Question

Motanul Garfield a comandat in trei zile 165 de pizza.Stind ca in primele doua zile a comandat 105 pizza,iar in ultimele doua zile 117 pizza. afla cate pizza a comandat Garfield in fiecare zi.

Answer 1

a- nr de pizza comandate in prima zi
b - a doua zi
c- a treia zi
a+b+c=165 (1)
a+b=105 (2)
b+c=117 (3)

adunam relatiile (2) si (3)
a+b+c+b=222
(a+b+c)+b=222
165+b=222
b=222-165
b=57

a+57=105 (din relatia 2)
a=105-57
a=48

57+c=117 (din relatia 3)
c=117-57
c=60

Verif 48+57+60=165
Garfield a comandat 48 de pizza in prima zi, 57 in a doua si 60 in a treia zi.