Question

A man can complete a job in 12 days and his wife complete the same job in 15 days how long will they take to complete job if they work together

Answer 1

Answer:

man-12

wife-15

LCM 60...efficiency 5 and 4...

60/9 days ans

Answer 2

Answer:

7 days

Step-by-step explanation:

Find the LCM of 12 and 15 = 60

SO, let there be 60 job to do.

That man does the work is 12 days means in a day he does 60/12 = 5 parts off the job

and his wife 60/15 = 4 parts in a day

therefore when they work together, 5+4 = 9 parts will be done in a day.

So the number of days required to complete the work when they work together = 60/9 = 6.67 = 7 days