Final answer:
The percentage decrease in the number of balls hit by Ralph from last week to this week is 25%. This was calculated by subtracting this week's count from last week's, dividing the difference by last week's count, and then multiplying by 100.
Step-by-step explanation:
The student is asking about the percentage decrease in the number of balls hit by Ralph from last week to this week. To calculate the percentage decrease, we first find the difference in the number of balls hit between the two weeks, and then divide that by the number of balls hit in the first week (last week) before multiplying by 100 to get the percentage. Here's a step-by-step solution:
- Determine the initial amount (last week): 20 balls
- Determine the final amount (this week): 15 balls
- Calculate the difference: 20 balls - 15 balls = 5 balls
- Calculate the decrease as a percentage: (5 balls / 20 balls) × 100 = 25%
Therefore, the percentage decrease in the number of balls hit from last week to this week is 25%.