If,
1 * 3 * 5 = 16
3 * 5 * 7 = 38
Then find,
11 * 13 * 15 =?  Pick:
A) 89 B) 49 C) 206 D) 38 E) 55
206   206   (15 * 13) + 11= 
<gadget id="calculator">(15 * 13) + 11</gadget>
<output>206</output>
206
<result>C</result>
If,
1 * 3 * 5 = 16
3 * 5 * 7 = 38
Then find,
11 * 13 * 15 =?