Question

si 5a-c=48 y
a/3=b/5=a/7
hallar el valor de a+b+c

Answer 1

5a-c=48
a/3=b/5=c/7

a/3=b/5 y b/5=c/7
a=3b/5 7b/5=c
hallando b
5a-c=48
5( 3b/5 )- 7b/5=48
(15b-7b)/5=48
8b/5=48
b=48*5/8
b=30

hallando a
a=3b/5
a=3*30/5
a=18

hallando c
7b/5=c
7*30/5=c
42=c