A. 20 for $2.47 is about 12 cents per ounce (0.1234)
32 oz for $2.99 is about 9 cents per ounce (.093)
40 oz for $3.79 is about 9 cents an oz (0.095)
B. The best deal is 32 ounce for $2.99 but not by much over 40 oz for 3.79
[ Answer ]

[ Explanation ]
- System Of Equations

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- Isolate x for x + x + 10 = 10: x = 0
For y = 10
Substitute x = 0
Y = 0 + 10
0 + 10 = 10
y = 10
X = 0
Y = 10
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The answer to the problem is A
So theres 4 hours and 60min equals 1 hour, so multiply 4 by 60 to get 240, so theres 240 minutes of time on the mp3. So 1/6 of that total time (240min) was on jazz, so what you do is divide 240 by 6 to get 40, so every 1/6 is 40min. So you could say he spend 40min listening to jazz, or you could say he spent 2/3 of an hour listening to jazz
Depends on the number line my guy