Question

You bake cookies for a bake sale. The ratio of chocolate chip cookies to oatmeal cookies is 7 : 5. You bake 15 oatmeal cookies. How many chocolate chip cookies do you bake?

You bake
chocolate chip cookies.

Answer 1

To find the number of chocolate chip cookies, set up a proportion using the given ratio and the number of oatmeal cookies. Solve the proportion to find the unknown number of chocolate chip cookies.

Step-by-step explanation:

To find the number of chocolate chip cookies, we need to determine the ratio of chocolate chip cookies to oatmeal cookies. The given ratio is 7:5. Since we know the number of oatmeal cookies is 15, we can set up a proportion to find the number of chocolate chip cookies. We can write the ratio as 7/5 = x/15, where x is the unknown number of chocolate chip cookies. Solving this proportion, we get x = 7/5 * 15 = 21.

Answer 2

You bake 21 chocolate chip cookies.

Step-by-step explanation:

Since the ratio of chocolate chip to oatmeal is 7:5, the ratio is now ?:15. You multiplied the number of oatmeal cookies by 3, which means you must now multiply the number of chocolate chip cookies by the same number. 7 times 3 is 21.