3 persons can build a wall in 4 days, then 4 persons can build it inA.

1.	3 persons can build a wall in 4 days, then 4 persons can build it inA. \(5\frac{1}{3}\) daysB. 3 daysC. \(4\frac{1}{3}\) daysD. none of these
Answer» More the no. of persons, lesser the days to build. So, it is an inverse proportion. Let the required duration be x days. ⇒ 3 × 4 = 4 × x ⇒ x = \(\frac{3\,\times\,4}{4}\) = 3 days

3 persons can build a wall in 4 days, then 4 persons can build it inA. \(5\frac{1}{3}\) daysB. 3 daysC. \(4\frac{1}{3}\) daysD. none of these

Answer»

More the no. of persons, lesser the days to build. So, it is an inverse proportion.

Let the required duration be x days.

⇒ 3 × 4 = 4 × x

⇒ x = \(\frac{3\,\times\,4}{4}\) = 3 days