Mitchell is a big coffee fan, so he always takes care of coffee brewing at the office. Normally he uses 100 grams of Robusta coffee to prepare 10 cups of coffee

Question

Mitchell is a big coffee fan, so he always takes care of coffee brewing at the office. Normally he uses 100 grams of Robusta coffee to prepare 10 cups of coffee. His friend brings him a packet of Arabica coffee and tells him that he should use 20%, percent more than usual when brewing Arabica coffee.
How many grams of coffee should he use to make a 15-cup pot of Arabica coffee?

Answer 1

If he uses 100 grams to brew 10 cups, this means he needs 100/10 or 10 grams per cup of Robusta.

 

To find out how much he needs per cup of Arabica, find 20% of 10 and add it on. 

 

10 x .20 = 2, so 10 + 2 means he needs 12 grams per cup of Arabica.

 

For a 15 cup pot, 12 x 15 = 180 grams.