In order to train for his fights Rocky would run 4 miles on day one of training.  Rocky would double the miles for day 2, and triple the miles from day 2 for day 3.  How many miles did Rocky run in the first three days of training?
Day 1:4.
Day 2:2(4)=8.
Day 3:8(3)=24.
Total:4+8+24=
<gadget id="calculator">4+8+24</gadget>
<output>36</output>
36 miles.

<result>36</result>