You collect baseball cards. Suppose you start out with 13. Maria takes half of one more than the number of baseball cards you have. Since you're nice, you give Peter 1 baseball card. Since his father makes baseball cards, Paul decides to triple your baseball cards. How many baseball cards do you have at the end?  Choose one:	A) 15	B) 18	C) 19	D) 20	E) 21
Solution   Start with 13 baseball cards.   Maria takes half of one more than the number of baseball cards you have. So Maria takes half of 13 + 1 which is 7,   so you're left with   13 - 7= 
<gadget id="calculator">  13 - 7</gadget>
<output>6</output>
6.   Peter takes 1 baseball card from you:  6 - 1= 
<gadget id="calculator"> 6 - 1</gadget>
<output>5</output>
5 baseball cards.   Paul triples the number of baseball cards you have: 5 Ã— 3= 15 baseball cards.   So you have 15 at the end.   Correct answer : 15
<result>A</result>
You collect baseball cards. Suppose you start out with 13. Maria takes half of one more than the number of baseball cards you have. Since you're nice, you give Peter 1 baseball card. Since his father makes baseball cards, Paul decides to triple your baseball cards. How many baseball cards do you have at the end?