Answer :
[tex]x-\ number\ of\ tickets\\\\
To\ find\ number\ of\ tickets\ divide\ all\ money\ that\ he\ has\ and \\ next\ divide\ by\ cost\ of\ one\ ticket\\\\
x=\frac{37.5\$}{5.25\$}=7.14....\\\\
He\ can\ buy\ 7\ tickets. [/tex]