Answer
3. How many 3000MB .avi files can be stored on a 1.9GB DVD-R?
These are the ACTUAL bytes a Megabyte and Gigabyte uses.
1 MB = 0.000977GB
1 GB = 1,024MB
But, it is commonly simplified into
1 GB = 1000MB
So, Fitting 3000MB .avi files into a 1.9GB DVD-R is not applicable because the DVD-R will only have 1900MB storage available. Unless you use file compressions like 7Zip and Winrar. You can divide the 3000MB .avi files into two 1500MB files and write it on two 1.9GB DVD-Rs.
4. How many 20 KB jpg files can be stored on a 50 MB folder in your hard drive?
As same as above, 1MB=1024KB, simplified into 1MB=1000KB
Convert MB to KB: 50MB * 1000 = 50,000KB
Divide by 20: 50,000KB / 20 = 2,500 files with the EXACT size of 20KB
5. How many 520 MB avi files can be stored on a 54 GB DVD-R?
Same as number 3, 1 GB = 1000MB
Convert GB to MB: 54GB * 1000 = 54000MB
Divide by 520: 54000 / 520 = 103 files with 520MB file size
Total MB: 103 * 520MB = 53,560MB
Remaining space: 54000 - 53560 = 440MB space remaining
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