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