Question

6 men can complete the electric fitting in a building in 7 days how many days will it take 21 men to do the job

Answer 1

Let the days = x
So, 6*7 = 21 *x
42 = 21 x
42 /21 =x
2 days = x

Answer 2

Let the Day be x
6\7=x\21 do croos multiple
6x=147
X=24.7

I hope answer is correct