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Which one of the following is not a prime number?

A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?

What is the probability of getting a sum 9 from two throws of a dice?

The cost price of 20 articles is the same as the selling price of x articles. If the profit is 25%, then the value of x is:

39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?