How many apples are there in the second volume of the second grade mathematics practice exam exercise?
answer
25
Analysis: The topic is known, but for Fangfang, it is as much as 10, which means that there are 20 more apples than Fangfang. I also know that two people have 30 apples, but there are 25 apples and Fangfang has 5 apples.