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At the carnival, tickets for the rides are $0.75 each, or you can buy an armband for $15 and ride unlimited for one night. At how many rides does the armband cost the same as buying individual tickets?
An elevator went from the bottom to the top of a tower at an average speed of 4 m/s, remained at the top for 90 s, and then returned to the bottom at 5 m/s. If the total elapsed time was 4 1/2 min., how high is the tower?
The college bookstore sells 3 types of calculators. They have a total of 40 calculators in stock. The total amount of revenue from these calculators will be $3,590. The most expensive type costs $75 more than the cheapest. Find the cost of each type.
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