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S is 4 years younger than Q and R is 4 years older than P. P and Q are twins. If the average age of all the four boys(P, Q,R and S) is 11 years, then the sum of the ages of the youngest and the oldest boy is-
(a)
20 years
(b)
22 years
(c)
28 years
(d)
30 years

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Important Questions on Ratio and Proportion
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A father’s age is four times the age of son. After years his age will remain only twice that of his son. Find out their ages.

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The ratio of the current age of X and Y is . Three years from now the ratio of their age will be . What is the present age of Y?

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Surya is years older than his son. In years, he will be twice as old as his son. What will be Surya's age after years?

