Question: If M:N=9:6, then what is the value of (M+N):(M-N)?

1. 5:2
2. 5:4
3. 5:1
4. 1:5

Answer: 3. 5:1

Solution:
(M+N):(M-N)
Dividing it by N on denominator as well as numerator
M/N=x=9:6=3:2
(M+N):(M-N)=(x+1)/(x-1)=2.5/.5=5
5:1