Infinite. The first 10 are:
693, 1386, 2079, 2772, 3465, 4158, 4851, 5544, 6237, 6930 . . .
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Multiples of 63 are the infinite set that starts 63, 126, 189, 252, 315, 378, 441, 504, 567, 630, 693, 756, 819, 882, 945, 1,008, and so on.The first 15 multiples of 63:63, 126, 189, 252, 315, 378, 441, 504, 567, 630, 693, 756, 819, 882, 945 . . . ∞
The lowest common multiple of 7 and 9 is 63. The common multiples of 7 and 9 are therefore the infinite set of multiples of 63. Thus, the common multiples of 7 and 9 are 63, 126, 189, 252, 315, 378, 441, 504, 567, 630, 693, and so on.
The LCM of 7, 9, and 11 is 693, their product.
The factors of 693 are 1, 3, 7, 9, 11, 21, 33, 63, 77, 99, 231, and 693.
Expressed as a percentage, 693/1500 x 100 = 46.2 percent.