Answer: Let's assume Ms. Wells bought x pounds of bananas and (11.75 - x) pounds of oranges.
The cost of bananas is $0.40 per pound, so the cost of x pounds of bananas is 0.4x.
The cost of oranges is $0.80 per pound, so the cost of (11.75 - x) pounds of oranges is 0.8(11.75 - x).
The total cost of the fruit purchase is $8.00, so we can write:
0.4x + 0.8(11.75 - x) = 8
Simplifying this equation:
0.4x + 9.4 - 0.8x = 8
-0.4x = -1.4
x = 3.5
Therefore, Ms. Wells bought 3.5 pounds of bananas.
So the answer is (B) 3.50 pounds.
Explanation: