To find out how many mini fruit juice boxes you need to make 2 1/2 quarts of fruit juice, you can follow these steps:
1. Convert quarts to fluid ounces: 2 1/2 quarts is equal to 2.5 quarts, and there are 32 fluid ounces in 1 quart. So, 2.5 quarts is 2.5 * 32 = 80 fluid ounces.
2. Now, divide the total required fluid ounces (80) by the amount in each mini fruit juice box (4 fluid ounces per box): 80 / 4 = 20.
You will need 20 mini fruit juice boxes to make 2 1/2 quarts of fruit juice.