Question:Abhishek was given a piece of work to be done in 24 days. The lazy person that he was, he works at 75%, 50%, 80% and 25% of his usual rate on 1^st, 2^nd, 3^rdand 4^th days respectively. In how many days will he finish the remaning jo. If he works at his usual rate from the 5^th day?

A: 21.7
B: 24
C: 25
D: 26.5

Ans: A
Solution: At his usual pace Abhishek can do 1/24 of the work in one day.
Work done on the first day = (3/4)(1/24)=1/32
second day= 1/48
third day = 1/30
fourth day = 1/96.
Work left = 1-[1/32+1/48+1/30+1/96] = 217/240
Time taken to complete remaining work= (217/240)* 24 = 21.7 days