Question

7 worker working 6 hours a day can build a wall in 12 days how many days will 3 hours take to build a similar wall working 8 hours a day ?

Answer 1

multiply everything like=7*6*12
then divide (7*6*12)/3*8
answer will be 21 workers

Answer 2

It will take 21 days.

According to the question,

7 workers 6 hours a day = 12 days

1 worker 6 hours a day = 12×7 days

1 worker 1 hour a day = 12×7×6 days

1 worker 1 hour a day = 504 days

3 workers 1 hour a day = 504/3 days

3 workers 8 hours a day = 504/3×8 days = 504/24 days = 21 days (answer)