Question

If 15 pumps of equal capacity can fill a tank in 7 days, then how many extra pumps will be required to fill the tank in 5 days?

• A. 6
• B. 7
• C. 14
• D. 21

Answer 1

Answer: (A)

6

Answer 2

The correct answer is option (A) : 6

Given:

Number of pumps required to fill the tank in 7 days = 15 (let's call this "A").
We want to find the number of extra pumps required to fill the tank in 5 days.

Let the number of extra pumps required be "n."

Now, the number of pumps required to fill the tank in 1 day with the extra pumps is (n + A).

The number of pumps required to fill the tank in 1 day is also given as 105 (from the information provided in the explanation).

So, (n + A)$\times$5 = 105

Now, substitute the value of A (which is 15):

(n + 15)$\times$5 = 105

Next, solve for "n":

n + 15 = 21

n = 21 - 15

n = 6

Therefore, the correct answer is 6. Six extra pumps will be required to fill the tank in 5 days.