Question
Ruchi, Khushi and Tej can do a piece of work in 30, 40
and 60 days respectively. In how many days can Ruchi do the work, if she is assisted by both Khushi and Tej on every third day?Solution
RuchiKhushiTej 304060 120LCM of 30,40,60 432 Working type -Ruchi +Ruchi+ (Ruchi +Khushi +Tej) Working in first 3 days =4+4+4+3+2=17units 3×7days =17×7=119units 21days =119units Remaining work =120-119=1unit 22days =1/4 days Total days = 21+1/4=85/4days
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