Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

If m : n = 3 : 2, then (4m + 5n) : (4m – 5n) is equal to = ?

a) 4 : 9
b) 9 : 4
c) 11 : 1
d) 9 : 1

Answer: c
Explanation:
$$\eqalign{ & m:n = 3:2 \cr & \frac{m}{n} = \frac{3}{2} \cr & \frac{{4m + 5n}}{{4m – 5n}} \cr & \frac{{n\left( {4\frac{m}{n} + 5} \right)}}{{n\left( {4\frac{m}{n} – 5} \right)}} \cr & \frac{{4 \times \frac{3}{2} + 5}}{{4 \times \frac{3}{2} – 5}} \cr & \frac{{6 + 5}}{{6 – 5}} \cr & = \frac{{11}}{1} \cr & = 11:1 \cr} $$

Join The Discussion