Question

The water level of a lake is at 35ft. It is rising at a rate of 3 inches per day. How many days will it take the lake to reach 40 ft?

Answer 1

20 days.

First of all, how many inches are in a foot?
1 inch = 1/12 foot
3/12 —> 1/4
5 feet until 40 is reached, but only .25 per day...
5 * 4 = 20