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srinivasa rao d
1/15 + 1/20 = 7/60
4 days they worked which is 7/60 * 4 = 7/15
calculate A and B work for 4 days and subtract this from total work
1- (7/15) = 8/15
abhishek D 1-7/15=8/15
smitha (D)8/15 p