Answer:
[tex]\tt m = 18[/tex]
Step-by-step explanation:
[tex]\boxed{ \begin{array}{}\tt \diagdown \!\!\!\!\!\frac{5}{9} = \diagdown \!\!\!\!\!\frac{10}{m} = \tt 90 \div 5m = 18 \\ \\\tt m = 18 \end{array}{}}[/tex]
