The ratio of ages of a father and his son was 5:1. What is the age of the son after five years, if the ratio of their ages is 3:1 by this time ?

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The average of 6 numbers is 25. If 3 more numbers , with an average of 22 are added to these numbers, what will be the average of the combined 9 numbers?

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In a container , there are 2 green marbles and 2 red marbles. You randomly pick the marbles. what is the probability that both of them are green?

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How many bits string of length 4 are possible such that they contain 2 ones and 2 zeroes ?

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If A has 4 elements and B has 8 elements then the minimum and maximum number of elements in A∪B are respectively __

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Three boys have marbles in the ratio of 19: 5: 3 If the boy with the least number has 9 marbles, how many marbles does the boy with the greatest number have?

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