Detailed Instructions: You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
Problem:debby makes 67 pancakes . she adds blueberries to 20 of them and bananas to 24 of them . the rest are plain . how many plain pancakes are there ?
Solution:
23