You collect baseball cards. Suppose you start out with 16. Since you're nice, you give John 7 baseball cards. How many baseball cards do you have at the end?  Pick one.
A) 11	B) 12	C) 13	D) 9	E) 15
Solution   Start with 16 baseball cards.   John takes 7 baseball cards from you:   16 - 7= 
<gadget id="calculator">  16 - 7</gadget>
<output>9</output>
9 baseball cards.   So you have 9 at the end.   Correct answer : 9
<result>D</result>
You collect baseball cards. Suppose you start out with 16. Since you're nice, you give John 7 baseball cards. How many baseball cards do you have at the end?