Coffee blend

From two types of coffee priced at 450 CZK/kg and 730 CZK/kg, 20 kg of a blend priced at 520 CZK/kg is to be prepared. How many kilograms of each type of coffee are needed?

Final Answer:

a =  15 kg
b =  5 kg

Step-by-step explanation:

a+b=20 450a + 730b = 520 20  450a+730(20a)=520 20  450 a+730 (20a)=520 20  280a=4200  a=2804200=15  a=15=15 kg
b=20a=2015=5 kg



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