Question

A farmer has enough food to feed 20 animals
in his cattle for 6 days. How long would the
food last if there were 30 animals in his cattle?
​

Answer 1

Answer:

here the number of animals and the number of days are in inverse proportion. Hence the food will last 4 days.

Explanation:

Answer 2

Answer:

4 days

Step-By-Step Explanation:

If the number of animals increases, then it will take fewer days to last.

Then the two quantities are in inverse proportions.

Let the required number of days be p.

$\because x_1y_1 = x_2y_2$

Where,

$\rm x_1 = 20, \: y_1 = 6, \: x_2 = 30$ and $\rm y_2 = p$ (let)

=> 20 × 6 = 30 × p

=> 120 = 30p

=> p = 120/30

=> p = 4

Hence the required number of days = 4.