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09/15/11(Thu)03:08 No.29680994 File1316070498.png-(451 KB, 830x650, Duplex Fields library.png)
>>29680648 You said she sold 600 total apples of both cultivars. 600 apples minus the number of Red Delicious is the number of Fujis. We'll represent that unsolved difference with the letter f (for Fuji).
You also said she sold 4116 bits worth of apples. Assuming she didn't overcharge or undercharge for any of them apples, the bits she got for the Fujis was 8 bits per Fuji, or 8 times f.
Take that 8 times f, and replace the f with 600-r, since that'll be the same number. The way we do that is multiply 8 by 600, and 8 by negative r. The result is that we replaced 8 times f with 4800 - 8r.
It's important to note that there isn't 4800 of anything at any point. The laws of mathematics mean that when we sort the numbers out at the end, they'll be meaningful, even if there are a few numbers that don't refer to anything real right now.
Then we just re-arrange 4116=5r-8r+4800 by subtracting 4800 from both sides of the equation. That way, we can subtract bits from bits, and inventory from inventory.
Once you have 3r=684, divide both sides by 3, and you have the number of Red Delicious sold. Then subtract 228 Red Delicious from the total 600 apples sold, and you can see she sold 372 Fujis. |