If the sum of two numbers is 15 and one of the numbers is 9, what is the other number?

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To determine the other number when one number is known, you can use the equation based on the information given.

You know that the sum of two numbers equals 15, and one of those numbers is 9. To find the second number, you can set up the equation:

First number (which is 9) + second number = sum (which is 15).

This can be rearranged to find the second number:

second number = sum - first number

second number = 15 - 9

second number = 6.

Thus, the other number is 6. This confirms that C is the correct choice.

The reasoning follows straightforward arithmetic where you subtract the known number from the total sum to isolate the unknown variable.

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