The number 3
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The common multiples of 15 and 27 are numbers that can be evenly divided by both 15 and 27. To find the common multiples, we need to identify the multiples of each number and then determine the numbers that appear in both lists. The multiples of 15 are 15, 30, 45, 60, 75, 90, etc., and the multiples of 27 are 27, 54, 81, 108, etc. The common multiples of 15 and 27 are numbers that appear in both lists, such as 45, 90, 135, etc.
The number at the midpoint of these two numbers is (15 + 27)/2 = 21
3(5-x) = 27 15 - 3x = 27 15 - 3x + 3x = 27 + 3x 15 = 27 + 3x 15 - 27 = 27 - 27 + 3x -12 = 3x -4 = x To check 3(5- -4) ? 27 15 - -12 ? 27 15 + 12 = 27
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