Posted by Justin on Thursday, February 14, 2013 at 12:33am.
rulers --- x
folders --- x+16
x + x+16 = 36
2x = 20
x = 10 , then y = 26
so she bought 10 rulers and 16 folders
now to the cost:
cost of ruler --- y
cost of folder --- y + .5
10y + 16(y+ .5) = 20,2
10y + 16y + 8 = 20.2
26y = 12.2
y = .4692
A ruler costs $0.47 and a folder costs $ 0.97
check:
10(.47) + 16(.97) = 20.22
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