You collect baseball cards. Suppose you start out with 16. Since you're nice, you give John 4 baseball cards. How many baseball cards do you have at the end?  Choose the correct choice from the following answers
A) 11	B) 12	C) 13	D) 14	E) 15
Solution   Start with 16 baseball cards.   John takes 4 baseball cards from you:   16 - 4= 
<gadget id="calculator">  16 - 4</gadget>
<output>12</output>
12 baseball cards.   So you have 12 at the end.   Correct answer : 12
<result>B</result>
You collect baseball cards. Suppose you start out with 16. Since you're nice, you give John 4 baseball cards. How many baseball cards do you have at the end?