Question 551157
12 = .3f + 1.5n<P>
It's a linear equation, so find two points.  Try when n=0 and f=0.<P>
If n=0 (0 notebooks) then it's 12 = .3f * 0
12/.3 = f = 40<P>
If f=0 (0 folders) then it's 12 = 0 + 1.5n
12/1.5 = n = 8.<P>
Those points show two combinations (n,f):  (8,0) and (0,40).<P>
If you graph it and look at the line, you'll find a third whole number  combination (4,20).
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