You collect pens. Suppose you start out with 5. Mike gives you another 20 pens. Since her father makes pens, Cindy decides to double your pens. Since you're nice, you give Sharon 10 pens. How many pens do you have at the end?
Answers
A) 39 B) 40 C) 41 D) 42 E) 43
Solution   Start with 5 pens.   Mike gives you 20 pens:  5 + 20= 
<gadget id="calculator"> 5 + 20</gadget>
<output>25</output>
25 pens.   Cindy doubles the number of pens you have: 25 Ã— 2= 50 pens.   Sharon takes 10 pens from you:  50 - 10= 
<gadget id="calculator"> 50 - 10</gadget>
<output>40</output>
40 pens.   So you have 40 at the end.   Correct answer: 40
<result>B</result>
You collect pens. Suppose you start out with 5. Mike gives you another 20 pens. Since her father makes pens, Cindy decides to double your pens. Since you're nice, you give Sharon 10 pens. How many pens do you have at the end?