P, Q and R are partners and invest in a business. P invests 1/5th of total investments and Q invests 1/4th of the total investments. What is the ratio of investments of P, Q and R respectively ?

4 : 5 : 11

Let the total investment be 20 units 

Then, P's investment = \(\frac{1}{5}\) x 20 = 4

 Q's investment = \(\frac{1}{4}\) x 20 = 5

Remaining = 20 - 5- 4 = 11

Ratio of investment P  :  Q  :  R

                             4  :  5  :  11