Final answer:
Stuart has 21 acres of land available to sell after keeping 2 1/2 acres for himself from the 23 1/2 acres he owns. There seems to be a typo in the provided answer options since 21 is not listed; however, option 'a) 20' is the closest.
Step-by-step explanation:
The question provided asks how many lots does Stuart have available to sell if he owns 23 1/2 acres of land and is keeping 2 1/2 acres for himself. To find the number of lots available for sale, we have to subtract the amount he is keeping from the total amount he owns.
Step 1: Write down the total number of acres Stuart owns, which is 23 1/2 acres.
Step 2: Write down the number of acres Stuart plans to keep for himself, which is 2 1/2 acres.
Step 3: Subtract the amount kept by Stuart from the total number of acres to find the amount available for sale: 23 1/2 acres - 2 1/2 acres = 21 acres.
Step 4: Thus, Stuart has 21 acres of land available to sell.
Looking at the answer options provided (a) 20, b) 25, c) 50, d) 55), it seems there may be a typo in the question since none of the options match the calculated answer. The correct answer based on the calculation is not listed, however, the option 'a) 20' is closest to the correct answer of 21 acres available to sell.