Which number when added to each of the numbers 6, 7, 15, 17 will make the resulting numbers proportional?

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Which number when added to each of the numbers 6, 7, 15, 17 will make the resulting numbers proportional?

A6

B5

C4

D3

Answer:

D. 3

Read Explanation:

(7x15) - (6 x 17) / (6+17) - (7+15) = 3

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