state gov Bihar Police SI (दरोगा) Mock Test Series 2025 Quantitative Aptitude Time and Work Work Efficiency
A, B and C can do a piece of work in 20 days, 30 days and 60 days respectively. If A works daily and on every third day B and C also work with A, then in how many days, will the work be completed?
1
21
2
18
3
12
4
15