Question 164: A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :
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time-and-work
A's 1 day's work =1;15B's 1 day's work =1;20(A + B)'s 1 day's work =1+1=7.152060(A + B)'s 4 day's work =7x 4=7.6015Therefore, Remaining work =1 -7=8.1515