What a Math

If 21x = 79x, what is the value of x?




Similar Math Riddles

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Asked by Neha on 05 Apr 2026


We have arranged an array of numbers below. What you have to do is use any kind of mathematical symbol you know excluding any symbol that contains a number like cube root. You can use any amount of symbols but you have to come up with a valid equation for all of them.

0 0 0 = 6
1 1 1 = 6
2 + 2 + 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

Asked by Neha on 04 Apr 2026

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

Asked by Neha on 28 May 2026


Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

Asked by Neha on 17 Mar 2026

What number divided by 4 is the same as that number minus 4?

Asked by Neha on 09 Oct 2025

The Puzzle: Here is a famous prize problem that Sam Loyd issued in 1882, offering $1000 as a prize for the best answer showing how to arrange the seven figures and the eight 'dots' .4.5.6.7.8.9.0. which would add up to 82

Asked by Neha on 03 Jun 2026


Solve below popular number sequence
314 159 265 358 979 323 846 ?

Asked by Neha on 09 Nov 2025

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Asked by Neha on 08 Jan 2021

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Asked by Neha on 17 Jul 2023


Can you find out which number multiplied by itself will give the output as 12345678987654321?

Asked by Neha on 27 Mar 2023

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.