| 2.   
 | You collect baseball 
cards. Mary gives you another 15 baseball 
cards. At your request, Sam decides to double your
quantity of baseball 
cards. Emily takes half of your baseball 
cards. Since you're cool, you give Sarah 12 baseball 
cards. In the end, you have 22 baseball 
cards. How many baseball 
cards did you originally have? 
 |