jenny wanted to make a quilt using a scale of 2.5 inches= 4 feet . her pattern has a scale drawing of 8.5 inches by 12.5 inches

To determine the actual size of Jenny's quilt, we need to use the scale 2.5 inches = 4 feet. Jenny's pattern has a scale drawing of 8.5 inches by 12.5 inches.

1. Firstly, we can calculate the scale factor by dividing the size on the pattern by the corresponding size in real life. In this case, we divide 8.5 inches by 2.5 inches and 12.5 inches by 2.5 inches.
- 8.5 inches / 2.5 inches = 3.4
- 12.5 inches / 2.5 inches = 5

2. The scale factor tells us how many times larger the actual size is compared to the pattern size. In this case, the pattern is 3.4 times smaller in length and 5 times smaller in width.

3. Since the pattern is smaller, we need to multiply it by the scale factor to find the actual quilt size. Multiply 8.5 inches by 3.4 and 12.5 inches by 5.
- 8.5 inches x 3.4 = 28.9 inches
- 12.5 inches x 5 = 62.5 inches

Therefore, the actual size of Jenny's quilt will be 28.9 inches by 62.5 inches, keeping in mind that these measurements are based on the given scale.