Solve the problem: In one bag there were 310 green apples, and in another bag there were 320 yellow apples. How many green and yellow apples were left when the children took 280 pieces?

Summary:

Problem Breakdown:

• Total green apples: 310
• Total yellow apples: 320
• Apples taken: 280

Step-by-step solution:

1. Step 1: Calculate the total number of apples.
   310 (green) + 320 (yellow) = 630 apples.
2. Step 2: Subtract the number of apples taken from the total.
   630 (total) - 280 (taken) = 350 apples.

Answer: 350 apples were left.