其它
There were three piles of plums and a camel wanted to eat some. Each pile had $30$ plums. The camel ate a few plums from the first pile and then ate as many strawberries from the third pile as were left in the first pile. Then it ate some plums in the second plie, and finally there were $5$ plums left in the second pile. How many plums in total did the camel eat? 
Overseas Competition->Knowledge Point->Calculation Modules
$30 + (30 - 5) = 55$ 