18
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The geometric mean of 15 and 24 is 18.973665961
They are: 5 to 6, 10 to 12 and 15 to 18
If y varies directly as x and y is 18 when x is 24, then y is always three fourths of x. So if y is 15, then x is 20.
15 units
Some equivalent fractions of 24/36 are: 2/3 = 4/6 = 6/9 = 8/12 = 10/15 = 12/18