Final answer:
The question seeks two numbers whose sum is 24, and various pairs such as 12 + 12, 23 + 1, or 18 + 6 all add up to 24. This illustrates how multiple combinations can achieve the same sum in mathematics.
Step-by-step explanation:
The question 'What plus what equals 24?' is asking for two numbers that add up to 24. There are infinite pairs of numbers that fulfill this condition, but here are some examples: 12 + 12, 23 + 1, or 18 + 6. Each of these pairs, when added together, equals 24. To perform in my head, if I use one of these pairs, like 12 + 12, it's a straightforward addition because 12 is half of 24, making it an easy mental calculation.
Examples of addition that result in 24:
12 plus 12 equals 24
23 plus 1 equals 24
18 plus 6 equals 24
Remember, regardless of which numbers you choose, as long as their sum is 24, the requirement is met. This is due to mathematics providing multiple paths to the same answer, and in this case, we're finding two numbers whose sum is 24.