Brain teaser: Can you fix this maths equation by adding just 1 line? You have 10 seconds
Do you have what it takes to solve this interesting brain teaser that requires you to add one line to an existing equation to fix it?
Most brain teasers shared on social media are challenging, but it is also true that solving them evokes a certain sense of accomplishment in people. Are you someone who loves solving puzzles even if they seem hard to crack? Here is one that may fit the bill. All you have to do is fix it by adding one line to an existing maths equation.

The brain teaser is posted on Reddit. "Add one line to make the equation true (≠ is not the answer)," reads the caption shared along with it. "Add 1 line to make the equation true. 5+5+5+ 5 = 555. P. S. You cannot cross the equal sign," reads the maths quiz.
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Are you someone who can easily solve this brain teaser?
This exciting puzzle was shared two days ago. Since then, it has collected more than 1,600 upvotes. The share has also accumulated numerous comments. While some shared the answers and offered explanations, a few expressed how the maths quiz baffled them.
What did Reddit users say about this brain teaser?
"Add an angular line to one side of the first plus symbol to make it a 4. Now out says 545+5+5=555," suggested a Reddit user.
"You only said that the answer can't be ≠. Make the equal sign less than or equal: ≤," added another.
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"My idea was: cross out the equals with a line that extends far enough to also cross out the PS statement," joked a third.
"You said we can only add one line but nothing about turning items. So I'm spinning two of the + and adding a minus to make it 5 x 5 + 5 x 5 = 55 - 5," posted a fourth.
"This is a fun one; I was able to figure it out pretty quickly, mostly by luck. I figured you had to do something to the operators, and it wasn't long before I figured out that one line would turn a + into a 4," wrote a fifth.
ABOUT THE AUTHORTrisha SenguptaTrisha Sengupta works as Chief Content Producer at Hindustan Times with over six years of experience in the digital newsroom. Known for her ability to decode the internet’s most talked-about moments, she specialises in high-engagement storytelling that bridges the gap between viral trends and traditional journalism. Throughout her tenure, Trisha has focused on the intersection of technology, finance, and human emotion. She frequently covers personal finance and real estate struggles in hubs like Gurgaon, Bengaluru, and Hyderabad, while also documenting the unique challenges of the NRI experience. Her work often highlights the movements and philosophies of global newsmakers and personalities like Elon Musk, Mukesh Ambani, Nikhil Kamath, Dubai crown prince, and MrBeast. From reporting on Amazon or Meta layoffs and startup culture to the emergence of AI-driven platforms like Grok and xAI, she provides a grounded and empathetic perspective on the stories shaping our world. When not decoding the internet, Trisha is likely offline: lost in a book, exploring a historical ruin, or navigating the world as a solo traveler. She balances her fast-paced career with family time and a healthy dose of curiosity, currently trading her "human" sources for silicon ones as she masters AI to future-proof her storytelling.Read More

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