2023 · Q99
A, B, and C can individually finish a job in 10, 15, and 6 days, respectively. If all of them work together, in how many days will they finish the job?
General Mental Ability, Quantitative Aptitude and StatisticsNumber system and arithmetic
- A2 days
- B3 days
- C4 days
- D5 days
Explanation
A, B and C do 1/10, 1/15 and 1/6 of the job per day respectively. Together they do (1/10 + 1/15 + 1/6) = (3 + 2 + 5)/30 = 10/30 = 1/3 of the job per day. They therefore finish the whole job in 3 days, option (b).