Nancy has six pairs of boots, nine more pairs of slippers than boots, and a number of pairs of heels equal to three times the combined number of slippers and boots. How many shoes (individual shoes, not pairs) does she have?
First find how many pairs of slippers Nancy has: 6 pairs + 9 pairs = 
<gadget id="calculator">6+9</gadget>
<output>15</output>
15 pairs.
Then add that number to the number of pairs of boots she has: 15 pairs + 6 pairs = 
<gadget id="calculator">15+6</gadget>
<output>21</output>
21 pairs.
Then triple that number to find how many pairs of heels she has: 21 pairs * 3 = 
<gadget id="calculator">21*3</gadget>
<output>63</output>
63 pairs.
Then add the number of pairs of each kind of shoe she has: 15 pairs + 6 pairs + 63 pairs = 
<gadget id="calculator">15+6+63</gadget>
<output>84</output>
84 pairs.
Then multiply the number of pairs by 2 to find the number of individual shoes she has: 84 pairs * 2 shoes/pair = 
<gadget id="calculator">84*2</gadget>
<output>168</output>
168 shoes.

<result>168</result>