Question

A+b+c=75
A:b=3
5+a=c
Care sunt numerele a , b, c ?

Answer 1

a+b+c=75
a:b=3
a=3b
c=5+a=5+3b
3b+b+5+3b=75
7b=75-5
7b=70
b=70:7=10
a=3b=3x10=30
c=5+a=5+30=35
30+10+35=75(verificare)

Answer 2

a + b + c = 75
a : b = 3    a = 3b
5 + a = c
3b + b + 5 + a = 75
3b + b +5 + 3b =75
7b = 75 - 5
7b = 70
b = 70 : 7
b = 10
a = 3b
a = 3 x10
a = 30
c = a + 5
c = 30 + 5
c = 35
verificam
30 +10 + 35 = 75