Pip\textquotesingle s mum bought a box of biscuits. On the first day, Pip ate half of all the biscuits and 4 more. The next day, Pip ate half of the remaining and 2 less. In the end, there were only 10 biscuits left. How many biscuits were in the box that mum bought? 
Overseas Competition->Knowledge Point->Word Problem Modules->Inverse Operation Problems