Jame gets 20 singing lessons.  He gets the first lesson free and after the first 10 paid lessons he only needs to pay for every other lesson.  Each lesson is $5.  His uncle pays for half.  How much does James pay?
The first lesson is free.
The lessons 2 to 11 cost 10*$5=$
<gadget id="calculator">10*5</gadget>
<output>50</output>
50.
He then had 9 remaining lessons where he had to pay for every other one.
So he pays for lessons 13,15,17&amp;19 = 4 lessons.
Those lessons cost 4*$5=$
<gadget id="calculator">4*5</gadget>
<output>20</output>
20.
So in total, the cost was $50+$20=$
<gadget id="calculator">50+20</gadget>
<output>70</output>
70.
So he paid $70/2=$
<gadget id="calculator">70/2</gadget>
<output>35</output>
35.

<result>35</result>