Mathematical Rates | MCQs

Explanation

Days in which 40 cows eat 40 bags of husk = 40 days

Days in which 1 cow eat 40 bags of husk = 40 * 40 days

Days in which 1 cow eat 1 bag of husk = (40 * 40) / 40 bags

In a dairy form 40 cows eat 40 bags of husk in 40 days, In 40 days one cow will eat one bag of husk

Explanation

Explanation

Explanation

7 spiders make 7 webs in 7 days.

This means 1 spider makes 1 web in 7 days.

Explanation

Tap X can fill the tank in 10 hours, which means it fills 1/10 of the tank per hour.

Tap Y can fill the tank in 15 hours, which means it fills 1/15 of the tank per hour.

When both taps are opened together, their combined rate of filling the tank is the sum of their individual rates:

(1/10 + 1/15) of the tank per hour

To add these fractions, we need a common denominator, which is 30. So we get:

(3/30 + 2/30) = 5/30 = 1/6 of the tank per hour

Since they fill 1/6 of the tank per hour together, they will fill the entire tank in 6

hours.