Question

Si a/3=b/5=c/2, además 3a-b+c=42. Calcular E=a+2b-5c

Answer 1

Hola!

a = 3k

b = 5k

c = 2k

3a - b + c = 42

3(3k) - (5k) + 2k = 42

6k = 42

k = 7

a = 3k = 3 (7) = 21

b = 5k = 5 (7) = 35

c = 2k = 2 (7) = 14

Calcular:

E = a + 2b - 5c

E = 21 + 2 (35) - 5 (14)

E = 21 + 70 - 70

E = 21