Answer:
Colombian coffee: 100 kg
Ethiopian coffee: 200
Step-by-step explanation:
Let x represent kg of Colombian coffee and y represent kg of Ethiopian coffee.
We have been given that the mixture of coffee is 300 kg. We can represent this information in an equation as:


We have been given that Starstruck coffee shop mixed Colombian coffee worth $5 per kilogram with Ethiopian coffee worth $8 per kilogram.
Cost of x kg of Colombian coffee would be
and Cost of y kg of Ethiopian coffee would be
.
The mixture is to sell for $7 per kilogram. We can represent this information in an equation as:

Upon substituting equation (1) in equation (2), we will get:







Therefore, 200 kg of Ethiopian coffee should be used.
Upon substituting
in equation (1), we will get:

Therefore, 100 kg of Colombian coffee should be used.
Choice A is the correct answer.
Answer: Substances.
Step-by-step explanation:
Battery acid,
Coke,
Vinegar,
Blood,
Beer,
Soda,
Urine,
Saliva,
Eggs.