The average time of Izzy's past 3 100-meter sprints is 15 seconds. If the average falls 1 second after Izzy finishes another sprint, how many seconds did it take Izzy to run the most recent sprint?
Choices.
A) 16  B) 11  C) 15  D) 14  E) 10
Total time to run 3 sprints = 3*15= 
<gadget id="calculator">3*15</gadget>
<output>45</output>
45   Total time to run 4 sprints= 4*14= 
<gadget id="calculator">4*14</gadget>
<output>56</output>
56   Time to run most recent sprint= 56-45= 
<gadget id="calculator">56-45</gadget>
<output>11</output>
11 seconds   Answer is 11
<result>B</result>
The average time of Izzy's past 3 100-meter sprints is 15 seconds. If the average falls 1 second after Izzy finishes another sprint, how many seconds did it take Izzy to run the most recent sprint?