Question

La un magazin de articole sportive sunt 750de biciclete,trotinete si triciclete.Cate sunt de fiecare fel,dacă triciclete si trotinete sunt 400,iar trotinete si biciclete sunt 600?

Answer 1

b+t+T=750 
t+T=400
b+t=600
b+400=750
b=750-400
b=350  biciclete
350+t=600
t=600-350
t=250  trotinete
250+T=400
T=400-250
T=150  Triciclete
V:  350+250+150=750

Answer 2

Notam biciclete=a;trotinete=b,triciclete=c
a+b+c=750
b+c=400
a=750-400=350(biciclete)
b+a=600
b+350=600
c=600-350=250(trotinete)
b+c=400
250+c=400
b=400-250=150(triciclete)
350+250+150=750(verificare)