5/N, where N is the unspecified number.
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Any number you can completely write with digits is rational. A rational number is any number that can be written as the ratio of integers. Negative 9 and 5 sevenths is the ratio of -68 to 7 .
The ratio of a single number is the number itself.
1). Any number that you can write down completely, using digits, decimal point, and fraction bar, is a rational number. So yes, 5/7 is rational. 2). Any number that can be written as the ratio of two whole numbers is rational. 5/7 is the ratio of 5 to 7. So yes, it is rational.
If there are 7 days in a week, and 2 days in a weekend, then the ratio would be 7:2
The ratio of 3 to 5 is 3/5.