<PRE><B>Question 341368</B>
c+n=284 c=284-n
1.25c+2.25n=521
1.25(284-n)+2.25n=521
355-1.25n+2.25n=521
n=166
c=284-166
c=118
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1.25*118+2.25*166=521
147.50+373.50=521</PRE>