Question

it takes 36 minutes for 7 people to paint 4 walls.How many minutes does it take 9 people to paint 7 walls

Answer 1

The time required by 9 people to paint 7 walls is 49 minutes

Explanation:

Given as :

The number of people (p1) = 7

The work done by them (w1) = 4

The time taken (T1) = 36 minutes

Again :

The number of people (p2) = 9

The work done by them (w2) = 7

Let the time Time taken (T2) = T2

So, we know as :

`(MEN * TIME)/(WORK)` = Constant

SO,
`(P1 * T1)/(W1)` =
`(P2 * T2)/(W2)`

Or,
`(7 * 36 min)/(4)` =
`(9 * T2)/(7)`

Or,
`(252)/(4)` =
`(9 T2)/(7)`

Or ,
`(252 * 7)/(9* 4)` = T2

∴ T2 = 49 minutes

Hence The time required by 9 people to paint 7 walls is 49 minutes Answer