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

If the sum of all digits in a whole number is 14 , find the smallest such number ?

 Consider the set of the first one hundred natural numbers {0,1,2,3,…,99}. Let k be the sum  of digits of a number in the set. Find the value of k such that the number of numbers whose digits add up to the same value is a maximum.

find the number of integer between 1 and 2000 with the property that the sum of digits equals 9

a) find the next two term in the sequence: 1; 4; 9; 16; 25;....;.....;
Answer: 
b) find the smallest two-digit number whose number is 7 times the sum of its digits? 
Answer:

The sum of digits of a 4 – digit number is 20. Find the least possible number.
đây là bài về toán tiếng anh đấy ai hiểu thì giảng cho mình với

The sum of the digits of a ten-digit number is epual to 9.What is the product of the digits of this number?

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

the number 53 and 134 have the same . sum of thier digits ( 5 + 3 = 8 and 1 + 3 + 4 = 8 ) what is the fist number greater than 2006 . Such that the sum of ít digits is the same as the sum of the digits of 2006 ?