A man, a woman and a boy can complete a work in 3, 4 and 12 days, respectively. How many boys must assist one man and one woman to complete the same work in one day?
What is the difference between the compound interest on a sum of ₹10,000 at 12% p. a. for \(1{1\over4}\) years when the interest is compounded annually and when the interest is compounded 5-monthly? (nearest to a ₹)
A house of height 100 metres subtends a right angle at the window of an opposite house. If the height of the window is 64 metres, then the distance between the two houses is