You collect coins. Suppose you start out with 11. Since his mother makes coins, Miguel decides to double your coins. Since you're nice, you give Mary 12 coins. How many coins do you have at the end?  Choose the correct choice from the following
A) 9	B) 10	C) 11	D) 12	E) 13
Solution   Start with 11 coins.   Miguel doubles the number of coins you have: 11 × 2 = 22 coins.   Mary takes 12 coins from you:   22 - 12= 
<gadget id="calculator">  22 - 12</gadget>
<output>10</output>
10 coins.   So you have 10 at the end.   Correct answer: 10
<result>B</result>
You collect coins. Suppose you start out with 11. Since his mother makes coins, Miguel decides to double your coins. Since you're nice, you give Mary 12 coins. How many coins do you have at the end?