the ratio of cups of chopped onion to the number of cups of chopped cilantro in salsa is 4:3; if the recipe calls for 2/3 cups chopped onion, how many cups of chopped cilantro are needed? How do I solve this?
The trick is to make each thing line up.
4 : 3
2/3 : x
Well, 2/3 is just 4/6, so we are dividing the initial ratio by 6. Divide the cilantro by 6 also and you'll see that you have 3/6 or 1/2 of a cup of cilantro.