SAT Mathematics Practice Test 4

The pool contains 600 gallons of water before the hose is turned on, and water flows from the hose into the pool at a rate of 8 gallons per minute. Thus, the number of gallons of water in the pool m minutes after the hose is turned on is given by the expression $600+8\mathit{m}.$ Therefore, after 70 minutes, there will be $600+8\left(70\right)=1160$ gallons of water in the pool