Wendy had $$30$$ stickers. First, she gave Aiden three stickers. Then, she gave Terry $7$ stickers. Now, each of the three people had the same number of stickers. At the beginning, how many stickers did they have in total? 
Overseas Competition->Knowledge Point->Word Problem Modules->Inverse Operation Problems
Now, Wendy had $30-3-7=20$ stickers. Then, all of them had $20\times3=60$ stickers, which was equal to the total number of stickers they had at beginning. 