Question 36
Ratio of present ages of P and Q is 9 : 4. The difference between their ages is 20 years. What will be the sum (in years) of their ages after 10 years?
Solution
Let present ages of P and Q be $$9x$$ and $$4x$$ years respectively.
According to ques, => $$9x-4x=5x=20$$
=> $$x=\frac{20}{5}=4$$
$$\therefore$$ Sum (in years) of their ages after 10 years = $$(9x+10)+(4x+10)$$
= $$13(4)+20=52+20=72$$
=> Ans - (C)
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