Don't know how to solve, please help.

Question

Two important ingredients for baking bread are yeast and flour. To make a loaf of bread of at most 30 servings, maintain a yeast to flour ratio of 1:200. If you're making a loaf of more than 30 servings, use a ratio of 1:180.

If you're making 30 servings of bread and using 0.25 oz of yeast, how many ounces of flour do you need?

If you're making 60 servings of bread and using 90 oz of flour, how many ounces of yeast do you need?

Answer 1

For 30 servings

yeast:flour = 1:200

1/200=.25/x => 50

You should do the 2nd part in exactly the same way.