If a developer has 15 acres to subdivide, how many 150' x 90' lots can be lined after allowing for 20% for streets and sidewalks?

To determine how many 150' x 90' lots can be created from 15 acres while allowing for 20% of the land for streets and sidewalks, it's essential to first calculate the usable land available after accounting for that percentage.

1. Calculate Total Land Area in Square Feet:
   • 1 acre = 43,560 square feet.

• Thus, 15 acres = 15 x 43,560 = 653,400 square feet.

2. Determine Usable Land After Deducting for Streets and Sidewalks:

   • Since 20% of the land is to be used for streets and sidewalks, only 80% is usable.
   • Calculate 80% of 653,400 square feet:
     • Usable land = 653,400 x 0.80 = 522,720 square feet.

3. Calculate the Area of One Lot:

   • Each lot is 150' x 90', which is:
     • Lot area = 150 x 90 = 13,500 square feet.

4. Calculate the Number of Lots:

   • The number of lots that can be created from the usable land is:
     • Number