Two-fifths of the seats in an auditorium that holds 500 people are currently taken. It was found that 1/10 of the seats are broken. How many seats are still available?
500/ 2/5 = 200 seats are already taken.
500/ 1/10 = 
<gadget id="calculator">500/1/10</gadget>
<output>50</output>
50 seats are broken.
So 200 + 50 = 
<gadget id="calculator">200+50</gadget>
<output>250</output>
250 seats are either taken or broken.
Therefore, 500 - 250 = 
<gadget id="calculator">500-250</gadget>
<output>250</output>
250 seats are still available.

<result>250</result>