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General Category => Whatever => Topic started by: pat on December 02, 2020, 06:16:54 AM

Title: Maths question
Post by: pat on December 02, 2020, 06:16:54 AM
This was posted on Facebook - people who attempted it posted many different answers. Some even helpfully explained in detail how they arrived at their (incorrect) answer.

If you want to post your answer, don't give any clues as to how you solved it. It's not a trick question.
Title: Re: Maths question
Post by: whisky on December 02, 2020, 06:42:01 AM
The answer is 15.

There are 2 parts to the exercise.

1
Careful observation of the actual question.

2
An understanding of fundamental arithmetic and the order of operators ( often called BODMAS ).

Michael
Title: Re: Maths question
Post by: pat on December 02, 2020, 07:02:40 AM
No clues!
Title: Re: Maths question
Post by: Ozzyjack on December 02, 2020, 08:31:09 AM
25

oops, I failed observation. But I have now been corrected by one who notices all my mistakes. ;D

I now agree with Michael - 15.

(https://sciencenotes.org/wp-content/uploads/2015/04/MathJokes.jpg)
Title: Re: Maths question
Post by: les303 on December 02, 2020, 08:33:58 AM
1 also came up with 25
Title: Re: Maths question
Post by: TRex on December 02, 2020, 08:53:49 AM
It depends on which order of operations one uses!
Title: Re: Maths question
Post by: les303 on December 02, 2020, 09:28:25 AM
I've had another look, put on my glasses & got closer to the screen.
It seems so obvious now.
Well done Michael.
Title: Re: Maths question
Post by: mkenuk on December 02, 2020, 11:15:37 AM
It depends on which order of operations one uses!

There is only one order of operations used in arithmetic, that is bodmas.
In the final line of the problem, the multiplication has to be done before the addition.
Title: Re: Maths question
Post by: whisky on December 02, 2020, 11:19:32 AM
Jack.
Speaking of Pi

Did you hear about the explosion at the Pie Factory ?
It was so loud, it could be heard from 3.141 miles away.

Michael
Title: Re: Maths question
Post by: TRex on December 02, 2020, 11:48:02 AM
There is only one order of operations used in arithmetic, that is bodmas.
In the final line of the problem, the multiplication has to be done before the addition.

Ah, but if the problem is done with a calculator .... !
Title: Re: Maths question
Post by: Calilasseia on December 02, 2020, 01:05:01 PM
The answer is 15.

Even though Pat requested us not to post working, I can supply this to anyone who is interested via other means. :)
Title: Re: Maths question
Post by: Began on December 03, 2020, 04:58:04 PM
Jack.
Speaking of Pi

Did you hear about the explosion at the Pie Factory ?
It was so loud, it could be heard from 3.141 miles away.

Michael

Another pi joke for algebra fans...

Q: what is the volume of a pizza if the radius  is z and the height is a?
A: pi•z•z•a
Title: Re: Maths question
Post by: Jacki on December 03, 2020, 08:09:36 PM
Hilarious!
Title: Re: Maths question
Post by: Alan W on December 03, 2020, 08:39:21 PM
Good one, Began.

And welcome to the forum!
Title: Re: Maths question
Post by: Dragonman on December 04, 2020, 03:22:42 AM
I maybe thicker than the milkshake but I make it 70
Title: Re: Maths question
Post by: pat on December 04, 2020, 04:00:23 AM
You're making two basic mistakes, Dragonman. Look carefully at the chips and think about the order of operations in arithmetic, aka bodmas.
Title: Re: Maths question
Post by: birdy on December 14, 2020, 08:16:06 AM
I don't remember ever learning anything about bodmas when I was learning arithmetic and equations. I do remember using lots of parentheses to keep functions separate.  But hey, it isn't easy to do arithmetic using Roman numerals.
Title: Re: Maths question
Post by: Ozzyjack on January 14, 2021, 10:12:14 PM
Hi began

I’ve  been quite remiss in not welcoming you to the forum.

So welcome and we look forward to many posts from you.