A3 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

There would be 63 grams of protein in 9 ounces of tuna.  

Step-by-step explanation:

Equivalent ratios compare two different quantities the have the same rate regardless of the amount.  In this example, for every 3 ounces of tuna, there are 21 grams of protein.  We can write this as a ratio of:  3/21.  Like fractions, we can simplify ratios by dividing the numerator and denominator by the same greatest common factor.  In this case, we would divide both the numerator and denominator by 3:  (3÷3)/(21÷3) = 1/7. So, our new ratio is for every ounce of tuna, we have 7 grams of protein.  Using equivalent ratios, we can set up our ratios to solve for the grams of protein in 9 ounces of tuna:  1/7 = 9/x.  Since we have to multiply both the numerator and denominator by the same factor, in this case 9, then our x = 63 grams of protein.

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