Mixture of nuts

The mixture of nuts should be prepared from almonds, peanuts and cashew nuts ratio 1: 2: 3 (respectively). The price of almonds is 150 CZK/kg, the price of peanuts is 140 CZK/kg and the price of cashew nuts is 180 CZK/kg. The price of the mixture is determined by the ratio in which the nuts are mixed.

What will be the price of one kilogram of the walnut mixture?

Correct result:

c =  161.667 Kc/kg

Solution:

$c=\dfrac{ 1 \cdot \ 150 + 2 \cdot \ 140 + 3 \cdot \ 180 }{ 1+2+3 }=\dfrac{ 485 }{ 3 }=161.667 \ \text{Kc/kg}$

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