Question

There are only 2 numbers that are twice the sum of their individual digits; one of them is zero (0). What is the other one?

Answer 1

Answer:

The sum of digits is 1+8 = 9. So the only positive TWO-DIGIT integer that is exactly twice the sum of its digits is 18.

Step-by-step explanation:

Answer 2

Answer:

18

Step-by-step explanation:

Concept= Aptitude

Given= The statement of summation

To find= The digit applying the statement

Explanation=

We have been given the information that there are only 2 numbers that are twice the sum of their individual digits, one of them is zero(0) and we need to find the other one.

Sum of individual digits implies that if it is a two digit number then the sum of digit in tenth place and the sum of the digit in unit place.

Example= 1) 10= 1+0 =1

                 2) 23= 2+3 = 5

                  and the chain continues.

So any digit more than 0 whose sum of individual digits multiplied by 2 is equal to the digit is: 18

because when we sum the individual digits of 18 and multiply the result by 2 the answer is the digit 18 itself.

Proof:

18: the individual digits are 1 and 8

Sum = 1+8=9

now multiplying 9 by 2 we get = 9*2=18

Therefore the digit whose twice the sum of individual digit is equal to the number is 18.

#SPJ2