A is 30% more efficient than E How much time will they , working together , take to complete a job which A alone could have done in 23 days?

A is 30% more efficient than E How much time will they , working together , take to complete a job which A alone could have done in 23 days? Correct Answer 13 days

1oo:130 = 10:13 Suppose, B takes xdays to do the work. Then,10:13 = 23:x x = (23 × 13÷10) x = 299÷10 A’1 day work = 1÷23 B’1 day work = 10÷299 (A + B) one day work = (1÷23 + 10÷299) = 23÷299 = 1÷13 they together complete the work in 13 days
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