9 x 18 = 162
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The answer is 9.
16
18 is a composite number because a prime number can only be multiplied by 1 and itself. 18 can be multiplied by 9 and 2 also.
18/8 * 9/16 = 18*9/(8*16) = 9*9/(8*8) = 81/64 or 1.265625
1 and 18 2 and 9 3 and 6