Answer:
22,170 pieces of paper in total.
Step-by-step explanation:
Let's break it down step by step:
1. The school uses 12,270 pieces of white paper.
2. The school uses 6,670 fewer pieces of blue paper than white paper. So, the number of blue papers used is: 12,270 - 6,670 = 5,600 pieces.
3. The school uses 1,300 fewer pieces of yellow paper than blue paper. So, the number of yellow papers used is: 5,600 - 1,300 = 4,300 pieces.
To find the total number of pieces of paper used, you simply add up the quantities:
12,270 (white) + 5,600 (blue) + 4,300 (yellow) = 22,170 pieces of paper in total.