In one yr, a school uses 12,270 pieces of white paper, 6,670 fewer pieces of blue paper than white paper, and 1,300 fewer pieces of yellow paper than blue paper. How many pieces of paper does the school use in all?
The number of blue paper used is 12,270 - 6,670 = <<12270-6670=5600>>5,600 pieces of blue paper.
The number of yellow paper used is 5,600 - 1,300 = <<5600-1300=4300>>4,300 pieces of yellow paper.
Therefore, the school uses 12,270 + 5,600 + 4,300 = <<12270+5600+4300=22170>>22,170 pieces of paper. Answer: \boxed{22170}.
Let's break down the problem step-by-step.
Step 1: Find the number of blue papers used.
The school uses 6,670 fewer pieces of blue paper than white paper, so we need to subtract 6,670 from the number of white papers.
12,270 - 6,670 = 5,600 blue papers
Step 2: Find the number of yellow papers used.
The school uses 1,300 fewer pieces of yellow paper than blue paper, so we need to subtract 1,300 from the number of blue papers.
5,600 - 1,300 = 4,300 yellow papers
Step 3: Find the total number of papers used.
To find the total, we add up the numbers of white, blue, and yellow papers.
12,270 + 5,600 + 4,300 = 22,170
Therefore, the school uses 22,170 pieces of paper in total.
To find out how many pieces of paper the school uses in total, we need to add the number of pieces of white paper, blue paper, and yellow paper.
Let's start by finding out how many pieces of blue paper the school uses. We are given that the school uses 6,670 fewer pieces of blue paper than white paper. So, we subtract 6,670 from the number of pieces of white paper:
12,270 - 6,670 = 5,600
Now, we need to find out how many pieces of yellow paper the school uses. We are given that the school uses 1,300 fewer pieces of yellow paper than blue paper. So, we subtract 1,300 from the number of pieces of blue paper:
5,600 - 1,300 = 4,300
Finally, to find the total number of pieces of paper used, we add the number of white paper, blue paper, and yellow paper:
12,270 + 5,600 + 4,300 = 22,170
Therefore, the school uses a total of 22,170 pieces of paper.