The first question? Okay, let's start.
I'll solve this as your freebie.
If Vijay has 4 hours of music, then we can start by converting 4 hours into minutes. 1 hour is 60 minutes, so 4 hours is 60 times 4. That's 240. Now if it says that jazz takes up 1/6 of those 240 minutes, then we need to divide by the denomerator. 240 divided by 6 is 40. Jazz takes up 40 minutes on Vijay's iPod.
To check, do 40 times 6.