# Aptitude - Problems on Numbers - Discussion

Discussion Forum : Problems on Numbers - General Questions (Q.No. 3)

3.

The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number?

Answer: Option

Explanation:

Let the ten's digit be *x* and unit's digit be *y*.

Then, (10*x* + *y*) - (10*y* + *x*) = 36

9(*x* - *y*) = 36

*x* - *y* = 4.

Video Explanation: https://youtu.be/7QOJjAmGVx0

Discussion:

58 comments Page 1 of 6.
Devshree vaidya said:
2 months ago

According to me.

The two-digit number I'll take is 10.

And subtract with 36.

So I'll get 26.

Then I have to find the difference between the two-digit number so I'll subtract 2-6 =4 so the answer is 4.

The two-digit number I'll take is 10.

And subtract with 36.

So I'll get 26.

Then I have to find the difference between the two-digit number so I'll subtract 2-6 =4 so the answer is 4.

Udaya said:
2 years ago

The question is that interchanging position.

Where did they ask 10th digit place?

Please explain me.

Where did they ask 10th digit place?

Please explain me.

(4)

Ayushi Nandy said:
2 years ago

Thanks everyone for explaining the answer.

(1)

Anoj said:
4 years ago

How can it solve using only one variable?

(1)

Jeevan said:
5 years ago

Here, it is given the number obtained by interchanging the position 2 digit number not 1 digit number like 93 - 39 = 36.

(1)

Haider alam said:
5 years ago

Let the unit place be x.

Ten =10x.

On interchanging position in difference.

10x-x=39,

9x=36,

x=36/9,

x = 4 answer.

Note : If we don't interchange the value of x will be -4.

Ten =10x.

On interchanging position in difference.

10x-x=39,

9x=36,

x=36/9,

x = 4 answer.

Note : If we don't interchange the value of x will be -4.

(5)

Arpish said:
5 years ago

If in the question it is asked to find the 2 digit number, then how can we find it, can anyone explain?

Aakash said:
5 years ago

Say 1 no is 84.

Then interchanging it we will get 48.

Difference between these two number is 36.

So, the difference between the two digit will be 4.

Then interchanging it we will get 48.

Difference between these two number is 36.

So, the difference between the two digit will be 4.

(1)

Mayur said:
6 years ago

Thanks for the explanation.

Shreya said:
6 years ago

Thanks for the explantion.

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