Posted by Matt on Tuesday, May 10, 2011 at 12:37pm.
$8/kg*Xkg + $7kg*Ykg = 7.25/kg*8kg,
Eq1: 8X + 7Y = 58,
Eq2: X + Y = 8,
Multiply Eq2 by -8, add the 2 Eqs and get:
-Y = -6,
Y = 6kgs of pecans.
Substitute 6 for Y in Eq2 :
X + 6 = 8,
X = 2 kgs of cashews.
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