Question

you have a bottle with a leak . after 2 seconds there are 28 ounces left in the bottle. after 6 seconds , there are 20 ounces left in the bottle. how much was in the bottle initialy?

Answer 1

We determine first the rate of flow of water out of the bottle by dividing the difference in the volume with the difference in time. 
                           r = (28 - 20) / (6 - 2)
                             r = 2 ounce/s
We calculate the first term by adding 2 ounce/s to the 2nd term, giving us the answer which is equal to 30 ounce/second.