SOLUTION: A rice retailer would like to sell rice for 20 pesos per kilo. All he has is 40 kilos of rice worth 18 pesos. How many kilos of rice worth 28 pesos should he add to the mix?

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Question 979048: A rice retailer would like to sell rice for 20 pesos per kilo. All he has is 40 kilos of rice worth 18 pesos. How many kilos of rice worth 28 pesos should he add to the mix?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Price wanted: 20 pesos/kilogram

Following your description very strictly:

Available:
* 40 kilograms at (18/40) pesos/kg
* unknown kilograms at (28/u) pesos/kg
-
The variable u, is how much of the 28%2Fu priced rice to use.


MONEY%2FMIXTURE=PRICE

highlight_green%28%2818%2B28%29%2F%2840%2Bu%29=20%29

46%2F%28u%2B40%29=20
23%2F%28u%2B40%29=10
23=10%28u%2B40%29
23=10u%2B400
10u=23-400
10u=-377
highlight_green%28u=-37.7%29------obviously makes no sense. The wording of the description is important. Your description as shown is unreliable as written. COST and PRICE do not mean the same thing.