Question

17      25

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18      36

Answer 1

17/18-25/36=34/36-25/36=9/36=1/4

Answer 2

$frac{17}{18}-frac{25}{36}=frac{34}{36}-frac{25}{36}=frac{34-25}{36}=frac{9}{36}=frac{1}{4}$