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100, 800 60 minutes in an hour, times 24 hours, times 7 days in a week, times 10
40 is 4 times as many as ten.
If you write every number once, then you will write the number nine exactly once. If you mean "... the digit9, it should appear 20 times: 10 times in the ten's place, and 10 times in the one's place.
240 hours
Ten hours.