Answer:
28 lots
Explanation:
First step is to convert the 25-acre area into square feet since that's the unit of the lot sizes, and we'll be able to divide apple by apples.
An acre is 43,560 Square Feet, so 25 acres are 1,089,000 square feet.
Since 35% will be used for common use, that means that only 65% can be divided into lots.
Area usable is: 1,089,000 * 65% = 707,850 SF
Then the minimum lot size is 25,000 SF, how many lots can he make?
Lots = 707,850 SF / (25,000 SF/lot) = 28.314 lots
So, he can make 28 lots.