the number 15/3 belongs to the set of rational numbers and the set of real numbers.
First, remember that the set of the real numbers contains all the numbers, so 15/3 trivially belongs to the set of the real numbers.
But, we also can see that 15/3 is the quotient of two integer numbers, so it will also belong to the set of rational numbers. Where rational numbers are these numbers that can be written as the quotient of two integer numbers.
Concluding, the number 15/3 belongs to the set of rational numbers and the set of real numbers.
If you want to learn more about rational numbers:
https://brainly.com/question/12088221
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