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compount interest

 9 years ago, the average age of a family of five members was 33 years. Now, three new members join whose ages are in ascending order with consecutive gaps of 8 years. If the present average age of the family is the same as it was 9 years ago, what is the age (in years) of the youngest new member?

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The difference between compound interest and simple
interest on Rs. X at 6.5% per annum for 2 years is Rs. 33.80.
What is the value of x?

144/2

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