Written math problem

Question

Ok so here’s the math problem I need solved: Violet made and drank about 18 fl of coffee this morning. The aproximate amount of water in a cup (8 US fl oz =1 US cup) of coffee is about 225ml of water. Violet wants to find out how much water was in her coffe that she made and drank this morning. Thank you!! :D

Answer 1

There are two ways to solve this problem, and both are correct...

I recommend learning how to do option #1, as it is much easier to use as you advance in mathematics, but there is no harm in using option #2 to check your work as you learn how to use this skill.

1.We can set up a proportion

(Part/Whole) = (Part/Whole)

(Water/ Oz) = (Water / Oz)

(x ml /18 oz) = (225 ml / 8 oz) ----- to solve this we will need to cross multiply

(x ml)*(8 oz) = (18 oz) * (225 ml)

8x = 4050 ml

x= 506.25 ml of water in her coffee



2.We can find the ml per oz and multiply by the amount we have

225 ml per 8 oz.

225ml / 8 oz. = 28.125 ml per oz.

28.125 ml * 18 oz. = 506.25 ml

x= 506.25 ml