So for this, we will be using dimensional analysis:

In short, he should receive ¥8835.30.
This is what the test said so option D
If 48/64 are both divided by 8 you would get 6/8! these can still be reduced to 3/4, So FALSE!
I think c I might be wrong tho :)
The nephew would need to use division to isolate x giving him $66.50 to spend