What a Math

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




Similar Riddles

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

Asked by Neha on 10 Aug 2024


If your uncle’s sister is not your aunt, what relation is she to you?

Asked by Neha on 28 Jul 2025

Solve the equation in the image by looking at the pattern closely.

Match the Box

Asked by Neha on 15 Feb 2024


Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

Asked by Neha on 23 May 2021

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Asked by Neha on 27 Aug 2021

Remove two matchsticks to make the below equation correct.

Make the Equation Correct

Asked by Neha on 23 Dec 2023


There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Asked by Neha on 10 Apr 2022

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

Asked by Neha on 13 Mar 2025

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

Asked by Neha on 05 Dec 2025


How do you go from 98 to 720 using just one letter?

Asked by Neha on 08 Oct 2021

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Out of the Box

The phrase “thinking outside the box” was popularised from the solution to a topographical puzzle involving 9 dots in a box shape.