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Q: How many two-digit numbers are twice the sum of their digits?

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None. The sum of one digit can't be twice the size of the digit.

Excluding numbers which begin with 0, there are 67,200 of them.

10 digits are numbers in the billions.

there are 899 whole numbers that have three digits.

24.

525

-99

99999

two

There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.

how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999

17 digits

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