Elmer and Elvin are emptying an 800 gallon tank while they fill a 1000 gallon - tank. They empty at the rate of 15 gallons per minute and fill at the rate of 25 gallons per minute. After how many minutes will bothe tanks contain the same number of gallons?

8

step-by-step explanation:

since we know that the two functions are equal, f (x) = g

(x), therefore when we equate the two equations the result should be similar to

3x = x – 4:

a. f(x) = 3x, g(x) = x – 4

equating the two functions:

3x = x – 4             (correct)

so we now got our answer (a)