Final answer:
To find the percentage of Giancarlo's gloves and mittens that had holes in them, divide the number of hand-wear with holes by the total number of hand-wear and multiply by 100.
Step-by-step explanation:
To find the percentage of his gloves and mittens that had holes in them, we first need to determine the total number of gloves and mittens Giancarlo has. He has 24 mittens and 22 gloves, so the total number of hand-wear is 24 + 22 = 46. Next, we need to determine the number of gloves and mittens that had holes in them. Given that 8 gloves and 15 mittens had holes, the total number of hand-wear with holes is 8 + 15 = 23. Finally, we can calculate the percentage by dividing the number of hand-wear with holes by the total number of hand-wear and multiplying by 100. Therefore, the percentage of Giancarlo's gloves and mittens that had holes in them is (23/46) * 100 = 50%.