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?

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.