SOLUTION: 1, two water tanks are being set up. each one starts with 100 liters of water, the first tank fills at the rate of 15 liters/min. the second fills at the rate of 20 liters/min. wh

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: 1, two water tanks are being set up. each one starts with 100 liters of water, the first tank fills at the rate of 15 liters/min. the second fills at the rate of 20 liters/min. wh      Log On


   



Question 907170: 1, two water tanks are being set up. each one starts with 100 liters of water, the first tank fills at the rate of 15 liters/min. the second fills at the rate of 20 liters/min. when will the first tank contains 7/3 as much as the second tank?

2, elmer and Elvin are emptying an 800 gal tank while they fill a 1000 gal tank. they emptying at the rate of 15 gal/min and fill at the rate of 25 gal/min. after how many minutes will both tank contains the same number of gallon?

Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Number 1:

First Tank, 100%2B%2815%29t

Second Tank, 100%2B%2820%29t

The second tank fills at a greater rate than the first tank. The second tank will have more water in it at any value for t. The first tank WILL NEVER contain 7%2F3 of the quantity of water as in the second tank based on the given conditions.


Number 2:

800-%2815%29t for emptying the 800 gal tank;
25%2At for filling the 1000 gal tank;

The emptying and filling actions start at the same time, assumed; so when are the quantities in the tanks equal?
800-15t=25t
800=25t%2B15t
40t=800
t=800%2F40
highlight%28t=20%29 MINUTES