To find out how many more miles Oliver has to go to arrive at his grandparents' house, you can subtract the distance he has already traveled from the total distance to his grandparents' house.
The total distance to his grandparents' house is 228.4 miles, and he has already traveled 137.65 miles.
So the calculation is:
228.4 - 137.65 = 90.75
Therefore, Oliver has 90.75 miles left to travel. The correct response is:
90.75
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