The number of tickets that Keith has left is;
(45 - 6x) tickets.
We are told that Keith buys 45 tickets for rides at the amusement park.
Each ride requires 6 tickets to ride. Thus;
1 ride = 6 tickets.
Now, if she has gone on x rides, it means by proportion;
number of tickets used = 6x tickets.
Since she bought 45 tickets, then it means that, number of tickets she has left are;
(45 - 6x) tickets.
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