Q: What number goes into both 15 and 27?

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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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All multiples of the lowest common multiple of 15 and 27 are in both their times tables. The lcm of 15 and 27 is 135, so all multiples of 135 are in both the 15 and 27 times tables: 135, 270, 405, 540, 675, 810, 945, 1080, 1215, 1350, ...

The number at the midpoint of these two numbers is (15 + 27)/2 = 21