Arvind can do a work in 20 days and Bakshi in 22 days. If they work on it together for 5 days, then the fraction of the work that is left is :
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 23/44.
Arvind and Bakshi can do the work in 20 days and 22 days
Total work (L.C.M of 20, and 22) = 220 units
The efficiency of Arvind = 220/20 = 11
The efficiency of Bakshi = 220/22 = 10
If they work on it together for 5 days
Amount of work done by them in 5 days = 5 × (10 + 11)
⇒ 5 × 21 = 105
Work left = 220 - 105 = 115 units
Fraction of left work = 115/220 = 23/44