The answer is 81. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
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23
The two equal numbers that have a sum of 54 are 27 and 27. When you add these two numbers together, you get 54. This is because the sum of two equal numbers will always be double the value of one of the numbers. In this case, 27 + 27 = 54.
2
The highest common factor of 54 and 27 is 27
2a^3 + 54 can first be factored into 2 (a^3 + 27). This can then be factored out to 2 (a + 3) (a^2 - 3a + 9).