Katie has 13 pink marbles. She has 9 fewer orange marbles than pink marbles. She has 4 times as many purple marbles as orange marbles. How many marbles does Katie have in all?
Find the number of orange marbles. 13 marbles - 9 marbles = 
<gadget id="calculator">13-9</gadget>
<output>4</output>
4 marbles.
Find the number of purple marbles. 4 marbles x 4 = 
<gadget id="calculator">4*4</gadget>
<output>16</output>
16marbles.
Find the total amount of pink, orange, and purple marbles. 13 marbles + 4 marbles + 16 marbles = 45 marbles.

<result>33</result>