Tony loved to solve difficult pen and paper puzzles.  He did a warm-up puzzle that only took 10 minutes and after that he did 2 puzzles that each took 3 times as long.  How long did he spend solving puzzles?
Each of the long puzzles took 3*10=
<gadget id="calculator">3*10</gadget>
<output>30</output>
30 minutes to solve.
So he spent 30*2=
<gadget id="calculator">30*2</gadget>
<output>60</output>
60 minutes solving them.
That means he spent 60+10=
<gadget id="calculator">60+10</gadget>
<output>70</output>
70 minutes solving puzzles.

<result>70</result>