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Admin
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Mensa Mind teaser

on Sun Dec 24 2017, 19:02
First topic message reminder :

1}I know MYG likes a puzzle so specialy for her and everyone else of course.

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?


2}Take 9 from 6, 10 from 9, 50 from 40 and leave 6.

How Come ??


Last edited by Admin on Thu Jan 04 2018, 20:45; edited 1 time in total

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raymyjamie
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Re: Mensa Mind teaser

on Thu Mar 08 2018, 12:42
@Gassey wrote:Close to it Ray
Spot on myg

Not my finest bit of logic Gassey.

We missed you on last night's cryptics.
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Re: Mensa Mind teaser

on Thu Mar 08 2018, 16:18
Find a number less than 100 that is increased by one-fifth of its value when its digits are reversed.
myg
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Re: Mensa Mind teaser

on Thu Mar 08 2018, 18:46
45    a lot of these number teasers involve 9 as a factor
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Admin
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Re: Mensa Mind teaser

on Thu Mar 08 2018, 18:53
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Re: Mensa Mind teaser

on Mon Mar 19 2018, 15:11
In an assessment the first 17 people scored an average of three points each. After a further 30 people had taken the assessment the average score rose to nine points each. What was the average number of points scored by the last 30 people only?
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Re: Mensa Mind teaser

on Wed Mar 21 2018, 13:02
@Admin wrote:In an assessment the first 17 people scored an average of three points each. After a further 30 people had taken the assessment the average score rose to nine points each. What was the average number of points scored by the last 30 people only?

Anyone havbing a go at this?
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raymyjamie
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Re: Mensa Mind teaser

on Wed Mar 21 2018, 20:40
I've had several 'looks' at it.

I'm having another 'go' now.
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raymyjamie
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Re: Mensa Mind teaser

on Wed Mar 21 2018, 20:52
Average = Total number of points divided by number of people.

Therefore total points = Average x number of people.

Total points for the first 17 = 17 x 3 = 51

Total points for first 47 = 47 x 9 = 423

Average for last 30 = 423 – 51 / 30 = 372 / 30

Average for last 30 = 12.4


Well, I found that strangely easy and straightforward.

I may be wrong of course Embarassed Laughing
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Admin
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Re: Mensa Mind teaser

on Wed Mar 21 2018, 20:56
No you're right. Very Happy
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raymyjamie
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Re: Mensa Mind teaser

on Wed Mar 21 2018, 21:07
Well, I is quite chuffed with that, cos on the surface

it seemed hard to do, but when you analise it, it's

fairly easy really.
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Admin
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Re: Mensa Mind teaser

on Wed Mar 21 2018, 21:15
well done you. Is there another one you might like to look at? I cant remember if I posted another. My connection is playing up something awfull
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raymyjamie
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Re: Mensa Mind teaser

on Wed Mar 21 2018, 21:30
I've found on 'Fun in the afternoon2'.

First reaction is, IT'S UNSOLVABLE!!!!!!!! confused Laughing
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Re: Mensa Mind teaser

on Fri Mar 23 2018, 08:56
2+3=8,
3+7=27,
4+5=32,
5+8=60,
6+7=72,
7+8=??

Can you solve this?
myg
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Re: Mensa Mind teaser

on Fri Mar 23 2018, 14:16
6x7+7x8=98
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Admin
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Re: Mensa Mind teaser

on Fri Mar 23 2018, 15:06
Bob on MYG

98

2+3=2*[3+(2-1)]=8
3+7=3*[7+(3-1)]=27
4+5=4*[5+(4-1)]=32
5+8=5*[8+(5-1)]=60
6+7=6*[7+(6-1)]=72
therefore
7+8=7*[8+(7-1)]=98
x+y=x[y+(x-1)]=x^2+xy-x
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Admin
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Re: Mensa Mind teaser

on Sun Apr 01 2018, 18:20
3 and 6 = 918

5 and 2 = 710

1 and 8 = 98

What does 4 and 4 =?
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raymyjamie
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Re: Mensa Mind teaser

on Sun Apr 01 2018, 18:50
4 and 4 = 816

The first figure is the sum of the two numbers, and the following

numbers are the product of the two numbers.
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Re: Mensa Mind teaser

on Sun Apr 01 2018, 18:56
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Re: Mensa Mind teaser

on Sun Apr 08 2018, 10:10
A car meter reading shows 72927 miles a palindromic number.
what is the minimum number of miles you would need to travel to see another palindromic number on the car meter reading?














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mache
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Re: Mensa Mind teaser

on Sun Apr 08 2018, 11:08
110
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Admin
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Re: Mensa Mind teaser

on Sun Apr 08 2018, 17:05
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Re: Mensa Mind teaser

on Mon Apr 09 2018, 23:34
Assume you are using a basic calculator and press the numbers in the order shown, replacing each question mark with a mathematical sign.

Plus, minus, multiply and divide can each be used once only.

In which order should they be used to score 24?



2 ? 8 ? 6 ? 9 ? 3 = 24
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Re: Mensa Mind teaser

on Tue Apr 10 2018, 11:00
2-8/6+9x3= 24 as a calculator will do the steps in order.
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Re: Mensa Mind teaser

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