Question
A can copy 70 pages in 20 hours, A and B together can
copy 120 pages in 12 hours. Then in how many pages can B copy 10 hours.Solution
Number of pages copied by x in hour = 70/20 = 3.5
Number of pages copied by x and y in 1 hour = 120/12 = 10
there4; Number of pages copied by y in 1 hour = 10 ndash; 3.5 = 6.5
there4; Required time = 6.5 x 10 = 65 pages
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