Please answer the following question by reasoning step-by-step.
Hannah brought $30 to the county fair. She spent half of it on rides and another $5 on dessert. How much, in dollars, is left?

10
She spent $30 / 2 = $15 on rides.

She spent a total of $15 + $5 = $20 including dessert.

She has $30 - $20 = $10 left.

.

So, the answer is 10