tcs - p and q individually can complete a task in 30 days and 40 days respectivelyif p and q worked together for 12 days and q alone worked for the remaining part of task then how many part of the task is completed by q alone - skillgun

P can complete the task in 30 days.
Then P's 1 day work = 1/30 Q can complete the task in 40 days then Y's 1 day work = 1/40.
Therefore, (P+Q)'s 1 day's work = 1/30 + 1/40 = 7/120.
And (P+Q)'s 12 days work = 12 x 7/120 = 7/10.
Remaining work = 1 - 7/10 = 3/10.So Q alone completes 3/10 of the given task.