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Which of the following fractions is halfway between $1312_w9_h37.png$ and $2923_w9_h37.png$?

A $8910_w18_h38.png$

Find the common denominator for the two fractions so that you can compare them. You can use the common denominator of 45, as follows: $1137_w55_h38.png$
Look at the numerators: 18 and 20. The number halfway between them is 19, so the answer is $8910_w18_h38.png$