Brain training: 7 Puzzles To Challenge Your Mind!
If it takes 7 seconds for 7 ticks, how many seconds will 10 ticks take? The answer is not 10. How many of these puzzles can you solve? Skills tested: outside...

MindYourDecisions
329.7K views • May 18, 2025

About this video
If it takes 7 seconds for 7 ticks, how many seconds will 10 ticks take? The answer is not 10. How many of these puzzles can you solve? Skills tested: outside the box thinking, creativity, logic, pattern recognition, Harvard entrance exam style question, interview question, mathematics, puzzle solving, problem solving, genius test
0:00 crazy 8s
1:17 gold split
5:41 circle e's
7:05 boys and girls
9:43 100 cat
10:41 clock ticks
14:01 lion interview
0:00 puzzle 1
https://www.popsugar.com/tech/how-many-8s-photo-45240276
https://timesofindia.indiatimes.com/life-style/health-fitness/de-stress/optical-illusion-how-many-8s-can-you-spot-in-this-image/articleshow/100931818.cms
1:17 puzzle 2
https://www.enjoymathematics.com/blog/gold-for-7-days-of-work
5:41 puzzle 3
adapted from
https://www.reddit.com/r/puzzles/comments/18vgolf/the_vicious_circle/
7:05 puzzle 4
https://testbook.com/question-answer/a-family-has-several-children-each-boy-in-this-fa--5fbf80bbfc893b72de95f225
https://www.wyzant.com/resources/answers/439319/a_family_has_several_children_each_boy_in_the_family_has_many_sisters_as_brothers_and_each_girl_has_twice_as_many_brothers_as_sisters_how_many_brothers_and_sist
https://aspirestudy.in/notifications/previous_year_papers/nimcet_2016.php
9:43 puzzle 5
https://www.youtube.com/watch?app=desktop&v=QSr4MuPx_2E
10:41 puzzle 6
https://prepyourmathblog.wordpress.com/2016/08/05/some-of-the-puzzles-from-shakuntala-devi-books/
https://en.wikipedia.org/wiki/Shakuntala_Devi
14:01 puzzle 7
adapted from
https://www.efinancialcareers.com/news/the-unusual-riddle-goldman-sachs-might-ask-you-in-a-quant-job-interview
Get early access to videos by supporting the channel
https://www.youtube.com/channel/UCHnj59g7jezwTy5GeL8EA_g/join
Patreon
https://www.patreon.com/mindyourdecisions
Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation=1
Send me suggestions by email (address at end of many videos). I may not reply but I do consider all ideas!
If you purchase through these links, I may be compensated for purchases made on Amazon. As an Amazon Associate I earn from qualifying purchases. This does not affect the price you pay.
Book ratings are from January 2025.
My Books (worldwide links)
https://mindyourdecisions.com/blog/my-books/#worldwide
My Books (US links)
Mind Your Decisions: Five Book Compilation
https://amzn.to/2pbJ4wR
A collection of 5 books:
"The Joy of Game Theory" rated 4.2/5 stars on 564 reviews
http://amzn.to/1uQvA20
"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" rated 4.2/5 stars on 55 reviews
http://amzn.to/1o3FaAg
"40 Paradoxes in Logic, Probability, and Game Theory" rated 4.2/5 stars on 81 reviews
http://amzn.to/1LOCI4U
"The Best Mental Math Tricks" rated 4.3/5 stars on 148 reviews
http://amzn.to/18maAdo
"Multiply Numbers By Drawing Lines" rated 4.5/5 stars on 57 reviews
http://amzn.to/XRm7M4
Mind Your Puzzles: Collection Of Volumes 1 To 3
https://amzn.to/2mMdrJr
A collection of 3 books:
"Math Puzzles Volume 1" rated 4.4/5 stars on 138 reviews
http://amzn.to/1GhUUSH
"Math Puzzles Volume 2" rated 4.2/5 stars on 45 reviews
http://amzn.to/1NKbyCs
"Math Puzzles Volume 3" rated 4.3/5 stars on 38 reviews
http://amzn.to/1NKbGlp
2017 Shorty Awards Nominee. Mind Your Decisions was nominated in the STEM category (Science, Technology, Engineering, and Math) along with eventual winner Bill Nye; finalists Adam Savage, Dr. Sandra Lee, Simone Giertz, Tim Peake, Unbox Therapy; and other nominees Elon Musk, Gizmoslip, Hope Jahren, Life Noggin, and Nerdwriter.
My Blog
https://mindyourdecisions.com/blog/
Twitter
https://twitter.com/preshtalwalkar
Instagram
https://www.instagram.com/preshtalwalkar/
Merch
https://teespring.com/stores/mind-your-decisions
Patreon
https://www.patreon.com/mindyourdecisions
Press
https://mindyourdecisions.com/blog/press
0:00 crazy 8s
1:17 gold split
5:41 circle e's
7:05 boys and girls
9:43 100 cat
10:41 clock ticks
14:01 lion interview
0:00 puzzle 1
https://www.popsugar.com/tech/how-many-8s-photo-45240276
https://timesofindia.indiatimes.com/life-style/health-fitness/de-stress/optical-illusion-how-many-8s-can-you-spot-in-this-image/articleshow/100931818.cms
1:17 puzzle 2
https://www.enjoymathematics.com/blog/gold-for-7-days-of-work
5:41 puzzle 3
adapted from
https://www.reddit.com/r/puzzles/comments/18vgolf/the_vicious_circle/
7:05 puzzle 4
https://testbook.com/question-answer/a-family-has-several-children-each-boy-in-this-fa--5fbf80bbfc893b72de95f225
https://www.wyzant.com/resources/answers/439319/a_family_has_several_children_each_boy_in_the_family_has_many_sisters_as_brothers_and_each_girl_has_twice_as_many_brothers_as_sisters_how_many_brothers_and_sist
https://aspirestudy.in/notifications/previous_year_papers/nimcet_2016.php
9:43 puzzle 5
https://www.youtube.com/watch?app=desktop&v=QSr4MuPx_2E
10:41 puzzle 6
https://prepyourmathblog.wordpress.com/2016/08/05/some-of-the-puzzles-from-shakuntala-devi-books/
https://en.wikipedia.org/wiki/Shakuntala_Devi
14:01 puzzle 7
adapted from
https://www.efinancialcareers.com/news/the-unusual-riddle-goldman-sachs-might-ask-you-in-a-quant-job-interview
Get early access to videos by supporting the channel
https://www.youtube.com/channel/UCHnj59g7jezwTy5GeL8EA_g/join
Patreon
https://www.patreon.com/mindyourdecisions
Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation=1
Send me suggestions by email (address at end of many videos). I may not reply but I do consider all ideas!
If you purchase through these links, I may be compensated for purchases made on Amazon. As an Amazon Associate I earn from qualifying purchases. This does not affect the price you pay.
Book ratings are from January 2025.
My Books (worldwide links)
https://mindyourdecisions.com/blog/my-books/#worldwide
My Books (US links)
Mind Your Decisions: Five Book Compilation
https://amzn.to/2pbJ4wR
A collection of 5 books:
"The Joy of Game Theory" rated 4.2/5 stars on 564 reviews
http://amzn.to/1uQvA20
"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" rated 4.2/5 stars on 55 reviews
http://amzn.to/1o3FaAg
"40 Paradoxes in Logic, Probability, and Game Theory" rated 4.2/5 stars on 81 reviews
http://amzn.to/1LOCI4U
"The Best Mental Math Tricks" rated 4.3/5 stars on 148 reviews
http://amzn.to/18maAdo
"Multiply Numbers By Drawing Lines" rated 4.5/5 stars on 57 reviews
http://amzn.to/XRm7M4
Mind Your Puzzles: Collection Of Volumes 1 To 3
https://amzn.to/2mMdrJr
A collection of 3 books:
"Math Puzzles Volume 1" rated 4.4/5 stars on 138 reviews
http://amzn.to/1GhUUSH
"Math Puzzles Volume 2" rated 4.2/5 stars on 45 reviews
http://amzn.to/1NKbyCs
"Math Puzzles Volume 3" rated 4.3/5 stars on 38 reviews
http://amzn.to/1NKbGlp
2017 Shorty Awards Nominee. Mind Your Decisions was nominated in the STEM category (Science, Technology, Engineering, and Math) along with eventual winner Bill Nye; finalists Adam Savage, Dr. Sandra Lee, Simone Giertz, Tim Peake, Unbox Therapy; and other nominees Elon Musk, Gizmoslip, Hope Jahren, Life Noggin, and Nerdwriter.
My Blog
https://mindyourdecisions.com/blog/
https://twitter.com/preshtalwalkar
https://www.instagram.com/preshtalwalkar/
Merch
https://teespring.com/stores/mind-your-decisions
Patreon
https://www.patreon.com/mindyourdecisions
Press
https://mindyourdecisions.com/blog/press
Tags and Topics
Browse our collection to discover more content in these categories.
Video Information
Views
329.7K
Likes
6.4K
Duration
21:08
Published
May 18, 2025
User Reviews
4.8
(65) Related Trending Topics
LIVE TRENDSRelated trending topics. Click any trend to explore more videos.
No specific trending topics match this video yet.
Explore All Trends