Olivia and Nigel are traveling in Asia.  Olivia has $112 and Nigel has $139. If together they buy six one day passes to a tourist attraction for $28 per ticket, how much money do they have left?
Let's think step by step.
83
They have 112 + 139 = $251.

The passes cost 6 * 28 = $168.

They have 251 - 168 = $83 left.

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The answer: 83