Question

a 3- ounce serving of tuna provides 21 grams of protein. use equivalent ratios to find how many grams of protein are in 9 ounces of tuna.​

Answer 1

A 3-ounce serving of tuna provides 21 grams of protein -> The ratio of the serving to the protein can be written as 3:21, or 1:7 (we'll take 3:21)

Now, we need to find how many grams of protein are in 9 ounces of tuna, which is 3 times aws much as our 3-ounce serving.
Therefore, the amount of protein must also be tripled :
21 x 3 = 63 (grams)
Or, if you want to use ratio : 3:21 = (3x3):(21x3) = 9 : 63

Therefore, in a 9-ounce serving of tuna, 63 grams of protein is provided.

Answer 2

63 grams of protein in 9 ounces of tuna.

Explanation:

Equivalent ratios are a rule of three problem.

In this problem, we have that:

3 ounce serving of tuna provides 21 grams of protein. To find the equivalent ratio, how many grams of protein are there in one ounce serving of tuna?

3 ounces - 21 grams

1 ounce - x grams

The ratio is 7 grams of protein per ounce, so 7:1.

So in 9 ounces of tuna, there are 9*7 = 63 grams of protein.