One kilogram of cheaper coffee costs CZK 150, one kilogram of more expensive coffee costs CZK 200. We have to prepare a mixture of 35 kg of coffee for 180 CZK. How do we prepare the mixture (how many of which kind of coffee do we need)?

Correct answer:

a =  14 kg
b =  21 kg

Step-by-step explanation:

150a+200b=180 35 a+b=35  150 a+200 b=180 35 a+b=35  150a+200b=6300 a+b=35  a=14=14 kg b=21

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