Answer:
9 ÷ 16
Explanation:
You want two numbers that have the ratio 9/16.
Division
The fraction 9/16 indicates division of 9 by 16:

In more general terms, you have ...
(any multiple of 9) ÷ (the same multiple of 16) = 9/16
For example, when the multiple is 3, this is ...
27 ÷ 48 = 9/16
A fraction bar and a division symbol (÷) mean the same thing:
9 ÷ 16 = 9/16
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Additional comment
You need to be careful with grouping. As far as the order of operations is concerned, the divisor in the quotient a÷b is the first symbol or token after the division sign. In this simple example, it is 'b'. If you write a÷bc, it is equivalent to the product (a÷b)·c.
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