SOLUTION: A grocer needs 30 kilograms of mixed spices which he wishes to sell for 35$/kg. How many kg of spices which sell for 25$ and for 40$ a kg respectively must he used to get the desir

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Question 1044168: A grocer needs 30 kilograms of mixed spices which he wishes to sell for 35$/kg. How many kg of spices which sell for 25$ and for 40$ a kg respectively must he used to get the desired mixture?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Give a variable to either unknown spice quantity.
x for the 25 dollars per kilograms spice
30-x for the 40 dollars per kilogram spice

%2825%28x%29%2B40%2830-x%29%29%2F30=35

two-part mixture using just one variable

You could use two variables if you want.