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40 is 4 times as many as ten.
100, 800 60 minutes in an hour, times 24 hours, times 7 days in a week, times 10
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.