其它
There are some identical candies on a electronic scale. The little bear wants to eat some of them. After eating $3$ candies, the scale shows $105$ grams. After eating a total of $5$ candies, the scale shows $75$ grams. How many candies are on the scale at first? 
Overseas Competition->Knowledge Point->Calculation Modules
The quality of each candy: $(105 - 75) \div 2 = 15$ g  The amount of the apples at first: $75~ \div 15 + 5 = 10$ 