Question

9people cultivated a farm in 28days how many days will 12people take to cultivate the same farm?

Answer 1

21 days

Explanation:

This is an inverse proportion, since the number of days required will be less the more people there are.

let number of people be p and days be d, then the equation is

d =
`(k)/(p)` ← k is the constant of proportionality

to find k use the condition d = 28 when p = 9, hence

k = dp = 28 × 9 = 252

hence d =
`(252)/(p)`

when p = 12, then

d =
`(252)/(12)` = 21 days