Question

Andrei si Bianca au impreuna 51 bomboane.Bianca si Cornel au impreuna 45 bomboane,iar Cornel si Andrei au impreuna 24 bomboane.Atunci:

a)Bianca are 9 bomboane
b)Bianca are 15 bomboane
c)Andrei are 9 bomboane
d)Andrei are 15 bomboane​

Answer 1

Răspuns:

d) Andrei are 15 bomboane

Explicație pas cu pas:

A+B=51

A=51-B

B+C=45

B=45-C

C+A=24

C=24-A

A=51-B

A=51-(45-C)

A=51-[45-(24-A)]

A=51-(45-24+A)

A=51-21-A

2A=30

A=30:2

A=15

Andrei are 15 bomboane