A 100-Gallon Tank Is Full of a Solution Containing 25 $t = 0$

Multiple Choice

A 100-gallon tank is full of a solution containing 25 pounds of concentrate. Starting at time $t = 0$ , distilled water is added to the tank at a rate of 10 gallons per minute, and the well-stirred solution is withdrawn at the same rate. Find the quantity of the concentrate in the solution as $t \rightarrow \infty$ .

A) 10
B) 26
C) 25
D) 0
E) 1