Mark does a gig every other day for 2 weeks.  For each gig, he plays 3 songs.  2 of the songs are 5 minutes long and the last song is twice that long.  How many minutes did he play?
He played 7*2 = 
<gadget id="calculator">7*2</gadget>
<output>14</output>
14 gigs.
The long song was 5*2=
<gadget id="calculator">5*2</gadget>
<output>10</output>
10 minutes.
So all the gigs were 5+5+10=
<gadget id="calculator">5+5+10</gadget>
<output>20</output>
20 minutes.
So he played 14*20=140 minutes.

<result>280</result>