“Jess wants 200 ribbons of length 110 centimeters for a party. However, the ribbons were sold at 25 meters per tape. How many tapes will Jess need?” Yahoo News reports many adults find this problem is too tricky. Can you figure it out?

My blog post for this video:

https://wp.me/p6aMk-5l2

Sources

The New Paper Question

http://www.tnp.sg/news/singapore/parents-irked-tricky-psle-maths-question

The New Paper Answer

http://www.tnp.sg/news/singapore/psle-ribbon-answer

Yahoo News Singapore

https://sg.news.yahoo.com/2017s-psle-maths-ribbon-question-needlessly-tricky-012631653.html

Mothership

https://mothership.sg/2017/10/can-you-solve-this-tricky-2017-psle-math-question-on-ribbons/

If you like my videos, you can support me at Patreon: http://www.patreon.com/mindyourdecisions

Connect on social media. I update each site when I have a new video or blog post, so you can follow me on whichever method is most convenient for you.

My Blog: http://mindyourdecisions.com/blog/

Twitter: http://twitter.com/preshtalwalkar

Facebook: https://www.facebook.com/pages/Mind-Your-Decisions/168446714965

Google+: https://plus.google.com/108336608566588374147/posts

Pinterest: https://www.pinterest.com/preshtalwalkar/

Tumblr: http://preshtalwalkar.tumblr.com/

Instagram: https://instagram.com/preshtalwalkar/

Patreon: http://www.patreon.com/mindyourdecisions

Newsletter (sent about 2 times a year): http://eepurl.com/KvS0r

My Books

“The Joy of Game Theory” shows how you can use math to out-think your competition. (rated 3.8/5 stars on 30 reviews) https://www.amazon.com/gp/product/1500497444

“The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias” is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 5/5 stars on 2 reviews) https://www.amazon.com/gp/product/1523231467/

“Math Puzzles Volume 1” features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 13 reviews. https://www.amazon.com/gp/product/1517421624/

“Math Puzzles Volume 2” is a sequel book with more great problems. (rated 5/5 stars on 3 reviews) https://www.amazon.com/gp/product/1517531624/

“Math Puzzles Volume 3” is the third in the series. (rated 3.8/5 stars on 4 reviews) https://www.amazon.com/gp/product/1517596351/

“40 Paradoxes in Logic, Probability, and Game Theory” contains thought-provoking and counter-intuitive results. (rated 4.3/5 stars on 12 reviews) https://www.amazon.com/gp/product/1517319307/

“The Best Mental Math Tricks” teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 4 reviews) https://www.amazon.com/gp/product/150779651X/

“Multiply Numbers By Drawing Lines” This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 3 reviews) https://www.amazon.com/gp/product/1500866148/

Who says math isn't useful in everyday scenarios?

I bought rolls of bitumen to cover a roof last week. The rolls came in 0,5m wide and 5m long. I had to cover 2,4x2m of roof. You don't patch bitumen, because it will leak – so the same solution applied.

Singapore math teachers teach their kids to be

SMART. What do we teach our kids in America?unsubbibbg… too many stupid questions

lol this was in psle 2017 question most people put 9

How can I get better at answering the types of questions on this channel?

This kind of problem is where a physicist will always beat a mathematician.

9.0909… rolls -> 10 rolls. 10 second problem

But to be honest, how is anyone going to combine those tapes in real life to make a ribbon. As an engineer, the thought of it just doesn't make sense. I would rather over estimate than be just nice and risk not meeting the requirements of the task. Therefore I am going with 10 which is the closest to what we will do in real life

I live in Singapore and I am 12 year old. Please… this question is not that tricky. U just have to use your brain

Lol idk why but when i was reading the question I thought the tape was the same thing as ribbons LOL otherwise it's a pretty normal question

Ridiculous. Stop making math videos about English wording. It's a waste of your time and ours. You'll never get people to agree. As an expert in math and English, I can tell you that 9 is the best answer, and it's the answer most experts would agree on. The problem says/implies just as much about allowing cutting of the tapes as it says about allowing gluing of the tapes: NOTHING. So we must stop and picture party ribbons. Is it fine to stick two shorter tapes of ribbon together to make a longer one? Yes, most of the time, since partygoers don't care about perfection of decorations. So Jess can cut the tapes of ribbon apart AND can tape pieces together. This problem most likely started when a teacher gave several examples of combining fractions of items in class and expected students to remember that they could do that – no need to state such on the test question. Then some parent who hadn't been in class saw the question, and things snowballed from there.

the ribbons can be tied together with each other,don't waste your tapes.

I really wish you would avoid these click bait titles.

the question itself did not specify cleary

Presh, this has to be said: You missed a golden opportunity to talk about common knowledge. That's the entire basis of this dissent, whether or not the ins and outs of crafting is common knowledge.

The dissent proves it's not common knowledge, but the question is worded under the assumption it is. This was a chance to teach everyone the game theory concept as well as rip into word problems once and for all, and you let it pass. As a result, the comments divided.

Why are you over complicating things

110-25*4= 110-100=10

But if the ribbon would be shorter by 9% (from 110cm to 100cm) then the total required amount of tapes could be reduced by 60% (from 10 to 4)… 😉