Stefano paid $7 per hour to rent a bicycle. Jordana paid $9 per hour to rent a bicycle. If they both rent bicycles for 3 hours, how much more will Jordana pay?

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Stefano would pay, 7*3.  This equals $21.

Jordana would pay 9*3. This equals $27.

27-21=$6.  Jordana would pay $6 more than Stefano.