Book Maths Puzzle Numerical Ability Age Problem

The ratio of Sohini age to the age of her mother is 3:11. The difference of their age is 24 years.what is the ratio of their age after 3 years

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Book Other Question

if a,b,c,and d are proportional then the mean proportion between a^2+c^2 and b^2+d^2 is ? How much money must I invest in 20/3 % stock at 10 premium to secure an annual income of Rs.600 ?