Question

Sendo 7/a = 2/b = 5=c e a+b+c = 70, calcule a+c

Answer 1

7/a = 2/b = 5/c = ( 7 + 2 + 5) / (a + b + c) = 14 / 70 = 1/5

7/a = 1/5

a = 35

5/c = 1/5

c = 25

a + c = 35 + 25 = 60

Answer 2

Resposta:

Se for 7/a=2/b=5/c

a=7b/2

c=5b/2

7b/2+b+5b/2=70

multiplique tudo por 2

7b+2b+5b=140

14b=140

b=10

a+b+c=70

a+10+c=70

a+c=60