Choose the correct answer

If the sum of two numbers is 84 and their difference is 30, the numbers are:

A. −57 and 27

B. 57 and 27

C. 57 and −27

D. −57 and −27

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Solution

Let one number be . Then the other number is .

Hence, the correct answer is B.

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The sum of the rational numbers $\frac{- 8}{19}$ and $\frac{- 4}{57}$ is _____.

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