$9
You find 16+6 (22)
That is the total cost for everything except the taxi. To find it out, you would find the difference between 31 and 22.
You find this by:
31-22=9
9
She spent $9.
$16+$6 is $22, so the total $31 minus $22 leaves us with the $9 she spent for the taxi.
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