Question

20 workers working for 8 hours a day build the wall in 15 days. how many hours a day will 12 workers take to complete the work in 10 days.

Answer 1

Answer:

20 hours a day.

Step-by-step explanation:

More number of workers work or more hours per day they work reduces total number of days required to build the wall.

∴ Number of days required (ND) is inversely proportional to both Number of workers work (NW) and Number of hours they work (NH) each day.

∴ $\frac{NW1 . NH1}{NW2 . NH2} = \frac{ND2}{ND1}$

∴ $\frac{20 . 8}{12 . NH2} = \frac{10}{15}$

$NH2 = \frac{16 . 15}{12} = 20$ hours a day