Final answer:
Mr. Bins' farm was originally 502.5 acres and he now has 201.25 acres left.
Step-by-step explanation:
To find the size of Mr. Bins' farm originally, we need to determine the fraction that represents the portion he has left. Since he now has 1/5 of what he originally had, it means he sold 4/5 of his farm. Since 4/5 represents the portion of the farm he sold, the fraction that represents the portion he still has is 1 - 4/5 = 1/5.
We know that he sold 1/2 of his farm to Mr. Frost and 100 acres to Mr. Slate. So if 1/5 of his farm represents the portion he still has, then we can set up the following equation:
1/5 = (1/2) + 100
To solve for the original size of his farm, we can multiply both sides of the equation by 5:
5 * (1/5) = 5 * (1/2) + 5 * 100
1 = 5/2 + 500
Next, we can simplify:
1 = 2.5 + 500
1 = 502.5
Therefore, the original size of Mr. Bins' farm was 502.5 acres.
To find the size of his farm now, we can subtract the portion he sold from the original size:
502.5 - (100 + (1/2) * 502.5) = 502.5 - 301.25 = 201.25 acres