Final answer:
The problem is a basic algebraic equation. To find the unknown number, you set up the equation as x + 7 = 15, then subtract 7 from both sides leading to x = 8. So, the sum of 8 and 7 indeed equals 15.
Step-by-step explanation:
The subject of the question is in the field of Mathematics, specifically, an algebraic word problem. Here's how you can find an unknown number when given its relation to another number:
According to the question, 'The sum of some number and 7 is 15'. Sum means to add, and in this case, you're adding some unknown number to 7 to get 15.
Since we know that the unknown number plus 7 equals 15, we set up the equation as such: x + 7 = 15.
To find the unknown number, we subtract 7 from both sides of the equation. This results in x = 15 - 7.
By performing the subtraction, we find that x = 8.
The number you're looking for is 8. So, the sum of 8 and 7 is indeed 15, which accurately solves the problem.
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