One inlet pipe can fill an empty pool in 8 hours, and a drain can empty the pool in 16 hours. How long will it take the pipe to fill the pool if the drain is left open?

16 hours

Step-by-step explanation:

1 inlet pipe can empty a pool in 8 hours

A drain can empty in 16 hours

Let y represent the time to fill up the pool of both outlets are left open

1/8 + (-1/16)= 1/y

1/8 - 1/16= 1/y

Collect The com

1/16= 1/y

y= 16 hours

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9