Question

determine três múltiplos consecutivos de 5 cuja soma seja 120

Answer 1

Multiplos de 5:

5,10,15,20,25,30,35,40,45,50, ...

35 + 40 + 45 = 120

Answer 2

1) x + 5  ==. 30+5 = 35

2) x + 10 ==. 30+10= 40

3) x + 15 = 30+15=     45 

(1 + 2 + 3)   ====>    120
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x + 5+ x+ 10 +x + 15 = ,120

3x = 120 - 30

3x = 90

x = 30