Answer :

luana
[tex]234\$\ for\ 18\ hours\\ 91\$\ for\ x\ hours\\\\ Ratio:\\ 234-18\\ 91-x\\\\Cross\ multiplication\\\\ 234x=18*91\\ 234x=1638\ \ \ | divide\ by\ 234\\x=7\\\\ To\ make\ 91\$\ he\ works\ 7\ hours. [/tex]

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