What is the sum of all digits in final result when 

1+11+111+…+11…111+11+111+…+11…11 (1010 digit 11s) 

is computed? 

Answer: The sum of all digits in final result is

the sum of the digits of a two-digit number is 11. when you reverse its digits you decrease the number by 9 . Find the number

1,3. Find the smallest odd three-digit multiple of 11 whose hundreds digit is greater than its units digit. 

2,4. Find the sum of all the integers between 150 and 650 such that when each is divided by 10, the remainder is 4.

Giúp mình nha

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the sum of the digits of a certain two - digits number is 11. when you reverse its digits you decrease the number by 9

Susan writes all the counting numbers, from 11 to 100100, on a piece of paper. She then asks her sister to find the number of all the digits found on the paper. The answer is .....

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What is the remainder when 1+11+111+.......+1111111111 is divided by 9 ?

choose any three digits from 1 to 9 to form a 3 - digit number and each digits is chosen only once. how many of these have the sum of all digit equal to 13