The number at the midpoint of these two numbers is (15 + 27)/2 = 21
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It is: 15
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
The number 3
3
The answer is 27. 10+15=25. 25+2=27.