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?

20% of 100 would be 20; so if we add on 20 to 100 we get:
120 grams to make a 10 cup pot of coffee.

Now, we need to convert 120 grams for 10 cups, into 15 cups.

So we essentially need to add on 5 more cups of coffee: So we will take half of the amount it took to make 10, and add it.

(120g/2 + 120g ) = 15 cup brew.

(60g + 120g) = 15 cup brew

180g = 15 cup brew.

Therefore, he will need 180g to make a 15-cup pit if Arabica Coffee.

I Hope this Helps!