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A and B together can complete a certain work in 20 days whereas B and C together can complete it in 24 days. If A is twice as good a workman as C, then in what time will B alone do 40% of the same work?
The height of a house subtends a right angle at an opposite window & the line through the window to the top of the house makes an angle θ with the vertical. If the breath of the street be ‘d’ meters. Find the height of the house