Question

if a/3=b/4=c/7thena+b+c/cis

Answer 1

a/3+b/3+c/c=a+b/3+1=a+b=3

Answer 2

a/3 = b/4 = c/7 .

From this,
a/c = 3/7
b/c = 4/7
c/c = 1 .

a+b+c/c = a/c + b/c + c/c = 3/7 + 4/7 + 1 = 2 .

Hope helped!