Answer:
70
Explanation:
You want the natural number that is 5 times another such that their sum is 84.
Fraction
If N is the natural number of interest, then it represents a fraction of the total that is ...
N/(N +N/5) = 5/6
Given the total is 84, the number of interest is ...
N = 5/6·84 = 70
The number is 70.
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Additional comment
The other number is 70/5 = 14. Of course, 70 +14 = 84.
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