Question

A large tank filled with water is to be emptied by removing 1/5 th of the water present in it
everyday. After how many days will there be closest to 25% of the water left in the tank :
(A) 7th day
(B) 6 day
(C) 8 day
(D) 3r day
​

Answer 1

Answer:

3 days

Step-by-step explanation:

We can convert the fraction removed per day to percentage.

1/5 × 100% = 20%

Everyday 20% of the water is removed.

We need to calculate the amount emptied for the amount to be close to 25%.

The amount emptied is = 100% - 25% = 75%

Given that it empties 20% per day we can get the number of days it takes to empty 75%.

1 day —> 20%

? —> 75%

By cross multiplication we have :

75/20 = 3.75 days

The complete days are 3 days.

Therefore it takes 3 days for the tank to be emptied close to 25%.