Julia's internet speed is 20 MBps (megabytes per second). How many songs she can download in half an hour if the size per song is 5MB?
1 hour has 60 minutes, therefore 1/2 hour has 1/2*60 = 
<gadget id="calculator">1/2*60</gadget>
<output>30</output>
30 minutes
1 minute has 60 seconds, therefore 30 minutes has 30*60 = 
<gadget id="calculator">1800</gadget>
<output>1_800</output>
1800 seconds.
If Julia's internet speed is 20MBps and each song has a size of 5MB, then it would take 5/20=1/4 seconds to download one song.
If it takes 1/4 seconds to download 1 song, then in 1800 seconds, Julia could download 1800/(1/4) = 1800 * 4 = 7200 songs.

<result>7_200</result>