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% 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

he uses 100 grams for 10 cups

 20% more would be 100 *1.20 = 120 grams for 10 cups

15/10 = 1.5

120*1.5 = 180

he needs 180 grams for 15 cups.