Question

During lunch, Mr. Lee eats a piece of chicken that contains 9 1/9 grams of protein, and Mr. Scott eats a piece of salmon that contains 7 1/7 grams of protein. How much more protein did Mr. Lee eat at lunch?

Answer 1

Mr. Lee ate
`1(61)/(63)` more protein than Mr. Scott

Explanation:

Find the least common denominator for both fractions.

9: 9, 18, 27, 36, 45, 54, 63

7: 7, 14, 21, 28, 35, 42, 49, 56, 63

Multiply 1/9 by 7/7:

`9 (1)/(9) = 9 (7)/(56) \\`

Multiply 1/7 by 9/9:

`7(1)/(7) = 7(9)/(63)`

Subtract the two fractions:

`9(7)/(63) - 7(9)/(63) = 1(61)/(63)`