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How many 3 digit numbers have a digit sum of 27?
Only one . . . 999 .
How many two-digit numbers are twice the sum of their digits?
Only one . . . . . 18
How many one-digit numbers are twice the size the sum of their digits?
None. The sum of one digit can't be twice the size of the digit.
How many eight digit number are there for which the sum of digit is 4?
120
What is the sum of all possible 2 digit number using the digits 3 and 4?
The sum is 154.
How many 4 digits numbers can be made using the digits 0 1 2 3 4 5 6 7 8 9 using each digit only once to give the sum 6?
18 can.
What is the sum of all possible four digit numbers using the digits 4068?
-- If you accept 4-digit numbers with 'zero' as the first digit, thenthere are 24 possibilities, and their sum is 119,988 .-- If the first digit can't be a 'zero', then there are 18 possibilities,and their sum is 115,992 .Note: I didn't repeat any digits.-- If you allow repeated digits, and accept leading zeros, then there are 256 possibilities,and their sum is 1,279,872.-- If you allow repeated digits but not leading zeros, then there are only 192 possibilities,and their sum is 1,247,904.
How many 5 digits numbers are there whose digits sum to 22?
There are 5460 five digit numbers with a digit sum of 22.
How many two-digit numbers has a digit sum equal to 5?
There are five such numbers.
How many distinct 4-digit numbers have a digit sum of 7?
-3
How many 7 digit phone numbers can be formed if the first digit cannot be 0 or 1 and any digit can be repeated?
Using your rule - essentially, it's the simplified sum of 9999999-2000000 which is a total of 7999999 numbers !
If you add several numbers how many significant figures can the sum have?
The sum of numbers can have as many significant figures as the number with the least significant figures in the original numbers. For example, if you add numbers with 3, 4, and 5 significant figures, the sum will have 3 significant figures.
