Question

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

(a) $5\frac{1}{3}days$ (b) 3 days

(c) $4\frac{1}{3}days$ (d) none of these

Answer 1

Answer : (b)

Let number of days = x, then

Persons 3 : 4

(Time taken to build a wall ) 4 : x

More person, less times take

$\therefore$ By inverse proportion,

3 : 4 : : x : 4

$x=\frac{4\times 3}{4}=3$

$\therefore$ Time taken to build the wall = 3 days