Question

ajutor va rog problema nr 12

Answer 1

a+b = 8
b+c = 5
a+c = 7
2×( a + b + c ) = 8 +5 + 7
a+b+c = 20 : 2
a+b+c = 10
c+8 = 10 c = 10 - 8 = 2 € are al treilea copil
a+5 = 10 a= 10 - 5 = 5 € are primul copil
5 +b = 8 b = 8 - 5 = 3 € are al doilea copil

Answer 2

a+b=8
b+c=5
a+c=7

a+b+b+c+a+c=8+5+7=
=13+7
=20.

20:10=2
a+b+c=10.
10-8=2(c).
10-5=5(a).
10-7=3(b).