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In triangle PQR length of the side QR is less than twice the length of the side PQ by 2 cm. Length of the side PR exceeds the length of the side PQ by 10 cm. The perimeter is 40 cm. the length of the smallest side of the triangle PQR is:

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How many different selections of 4 books can be made from 10 different books , if 2 particular books are never selected?

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A can finish a work in 5 days and B takes 4 days to do the same work. If the work is increased by 8 times, how many days will it take for both of them to finish the work if they work together?

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A computer can perform 30 identical tasks in 6 hour. At that rate, what is the minimum number of computers that should be assigned to complete 80 of the tasks within 3 hours?

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