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The correct answer is C
In a school, there are 20 teachers. The average age of all the teachers is 40 years. If the age of three principals is included, then the average age is...
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The current age of B is 40% greater than the present age of 'V'. The age of 'V' five years from now will be the same as the age of 'B' five years ago. D...
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A person’s present age is 4/5th of the age of his brother. After 10 years, he will be 9/10th of the age of his brother. How old is the brother at pr...