Question

X can do a job in 10 days, Y in 15 days and Z in 18
days. Y and Z begin the work but have to leave after
3 days. How many days will X take to finish the job?​

Answer 1

Answer:

Step-by-step explanation:

(Y + Z)'s one day's work = 1/15 + 1/18 = 11/90.

(Y + Z)'s 3 day's work = 1/15 + 1/18 = 33/90.

Remaining Work = 1 — 33/90 = 57/90. ,

Time taken by X = 57/90 ÷ 1/10 = 57/9 days.