800
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it is 1000 taking away 200 4 times
475
first way is easy: 1000 minus 775 second way (might be the second way but not sure): minus 775 from 100 plus 225
If this is a riddle, the answer is "only once, because after that you have only 879 to subtract from". Otherwise, you can subtract 8 lots of 121 from 1000.
250