Randy just turned 12 and started playing the piano. His friend Sheila told him about the 10,000-hour rule which says, after 10,000 hours of practice, you become an expert or master in your field. If Randy wants to become a piano expert before he is 20, how many hours a day will he need to practice if he practices every day, Monday – Friday, and takes two weeks off for vacation each year?
Randy has 20 - 12 = 
<gadget id="calculator">20-12</gadget>
<output>8</output>
8 years until he is 20.
He must practice 10,000 hours / 8 years = 
<gadget id="calculator">10000/8</gadget>
<output>1_250</output>
1,250 hours a year to become an expert.
There are 52 weeks in a year - 2 weeks of vacation Randy plans to take = 
<gadget id="calculator">52-2</gadget>
<output>50</output>
50 weeks of practice for Randy.
Randy will practice Monday - Friday, which is 5 days a week, so 50 weeks x 5 days = 
<gadget id="calculator">50*5</gadget>
<output>250</output>
250 days of practice each year.
Randy will need to practice 1250 hours / 250 days = 
<gadget id="calculator">1250/250</gadget>
<output>5</output>
5 hours each day.

<result>5</result>