Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
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?

### Response:
Olivia and Nigel have 112 + 139 = <<112+139=251>>251 dollars.
Six one day passes cost 28*6 = <<28*6=168>>168 dollars.
They have 251 - 168 = <<251-168=83>>83 dollars left.
#### 83