Question

a/3 = b/5 = c/7 ,
then, ( a + b+ c)/a = ??

Answer 1

let a/3 = b/5 = c/7 = x

so , a = 3x

=) b = 5x

=) c = 7x

now we have to find

=) (a+b+c)/a = (3x + 5x + 7x)/3x

=) 15x/3x = 5

so required value is 5 ans.

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hope it will help u

Answer 2

a/3=b/5=c/7=x (say)
a=3 x
b=5x
c=7x
then
(a+b+c)/a= (3x+5x+7x)/3x
=15x/3x=5