The question is:
How do you make 727 out of 1 8 9 10 75 100 ?
Here's one answer: 727 = (100 - 9) x 8 - 1 = 91 x 8 - 1 = 728 - 1
The 10 and 75 went unused, which is Ok.
If you want to use all of the numbers, here's another solution:
727 = 8 x 75 + 100 + 10 + 9 + 8 = 600 + 127
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