A tank with capacity T gallons is empty. Tank will be filled in
minutes
<u>Solution:</u>
Given, A tank with capacity T gallons is empty.
We have to find how many minutes will tank be filled?
Now, Water flows into the tank from pipe X at the rate of X gallons per minute,
And water is pumped out by pipe Y at the rate Y gallons per minute,
Then, together in one minute the amount of water filled will be x – y gallons [as X is greater than Y]
Now, the time take to fill tank = 
Hence tank will be filled in
minutes
Answer: lisa earns 6 dollars per hour
Step-by-step explanation:
45 divided by 7.5 =6
She makes 5% on 5000 and 7.5% on the other 3000.
0.05 x 5000= 250
0.075 x 3000= 225
Add 250 and 225
She earns $475 in all.
The answer you are looking for is (7, 2).