SOLUTION: in what ratio must milk costing $760 and $840 per kg be mixed to produce a milk costing $810 per kg

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Question 1186681: in what ratio must milk costing $760 and $840 per kg be mixed to produce a milk costing $810 per kg
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
In what ratio?

x of the $760 and y of the $840

%28760x%2B840y%29%2F%28x%2By%29=810

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760x%2B840y=810%28x%2By%29
760x%2B840y=810x%2B810y
30y=50x
%2830%2F50%29y=x
highlight%28highlight%28x%2Fy=3%2F5%29%29

3 parts of the $710 milk and 5 parts of the $840 milk.

Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.

As I used to think, milk is a liquid, and the measure unit for liquid is the liter.