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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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Re: Mensa Mind teaser

on Wed Feb 28 2018, 14:29
Give over Very Happy
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Kryten
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Re: Mensa Mind teaser

on Wed Feb 28 2018, 18:15
7.5?
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Re: Mensa Mind teaser

on Wed Feb 28 2018, 18:51
Ah the brains of the outfit



The minute hand is pointing directly at the '3'. The hour hand is 1/4 of the way between the '3' and '4'. Since there are 12 numbers the angle between each number is 30 degrees. So the angle between the hands are 30 degrees * 1/4 = 7.5 degrees.
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Re: Mensa Mind teaser

on Thu Mar 01 2018, 22:02
A car has travelled 50 miles at 70 mph.

It started its journey with eight gallons of fuel but its tank has been leaking throughout the journey and is now dry.

The car completes 25 miles per gallon.

How many gallons of fuel does it leak per hour?
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raymyjamie
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Re: Mensa Mind teaser

on Fri Mar 02 2018, 13:12
The car uses 25 miles per gallon, so when it stopped after 50 miles
it had used 2 gallons of fuel.
Since it had originally 8 gallons, it leaked 6 gallons of fuel over
the journey of 50 miles.

The time taken for the journey was 50/70 hours = 0.714 hours

Fuel usage = gallons/hour = 6 / 0.714

Fuel usage = 8.4 gallons per hour

I saw this last night, but 10 o'clock is a little late for brain work LOL Embarassed Laughing
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Re: Mensa Mind teaser

on Fri Mar 02 2018, 16:10
I thought I'd stick that one on for any night birds. Obviously everyone was tucked up nice and warm Wink

Yes 8.14  Well done you
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Re: Mensa Mind teaser

on Sat Mar 03 2018, 19:27
I think that was for me but unfortunately engaged with police and undertakers until after 2a.m. that night.Well done Ray .I can see you enjoyed the question.
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Re: Mensa Mind teaser

on Sat Mar 03 2018, 20:07
Thank you myg.

I'm OK with straightforward puzzles, especially if you can

employ the use of algebra or formulas,being an ex engineer

I find those easy.

The planes flying round Bagshot Island one of a few days ago

just freaked me out LOL  Embarassed   Laughing
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Re: Mensa Mind teaser

on Sat Mar 03 2018, 21:34
I found the airplane one manageable by breaking the flights into degrees of the circle.i.e. a full tank allows 180 degrees of travel.
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Re: Mensa Mind teaser

on Sat Mar 03 2018, 21:46


You are standing next to three switches. You know these switches belong to three bulbs in a room behind a closed door – the door is tight closed, and heavy which means that it’s absolutely impossible to see if any bulb is on or not. All three switches are now in position off.

You can do whatever you want with the switches and when you are finished you open the door and go into the room. While in there you have to tell which switch belongs to which bulb.

How will you do that?

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Re: Mensa Mind teaser

on Sun Mar 04 2018, 13:44
I've been ruminating this since last night.
If you turn 2 lights on, you will know which switch the unlit light belong to.
How do you know which of the 2 lit lights is which.

I think you switch one light on first, and leave it to warm up.
Then switch it off.
Then turn any one of the 2 remaining switches on.
You enter the room, and the switches of the 'warm bulb plus the 'lit' bulb can be determined.
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Re: Mensa Mind teaser

on Sun Mar 04 2018, 13:58
Near enough Very Happy

Turn on the first switch and wait for a while. Turn off the first one and turn on the second. Go into the room. One bulb is shining, the second bulb is hot and the third one nothing...
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Re: Mensa Mind teaser

on Sun Mar 04 2018, 19:12
Solve the mathematical equation in the picture below.

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Re: Mensa Mind teaser

on Sun Mar 04 2018, 20:01
Cylinder = 8

Cross = 17

Cone = 11

Cross +Cylinder + Cone = 36
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Re: Mensa Mind teaser

on Sun Mar 04 2018, 20:21
Nearly Wink
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Re: Mensa Mind teaser

on Sun Mar 04 2018, 20:31
Cylinder = 8

Cross = 17

Cone = 9

Cross +Cylinder + Cone = 34

Can't believe I made a fundamental error in subtracting 8 from 17 Embarassed Embarassed Embarassed Laughing
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Re: Mensa Mind teaser

on Sun Mar 04 2018, 20:49
You had me thinking. Very Happy

Yes 34
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Re: Mensa Mind teaser

on Sun Mar 04 2018, 21:37
decode this picture and tell me what it says ?

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raymyjamie
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Re: Mensa Mind teaser

on Sun Mar 04 2018, 21:53
Not sure of how the first symbol translates, it is obviously the square root of minus 1,

is it ‘root one’?

The second symbol is 2 cubed, which would translate as eight = ate.

The third symbol is ;sigma’, but is more likely to be the word ‘Sum’ = some,

because it is used in calculus for that function.

The fourth symbol of course is ‘Pi’ = pie.


Summat ate some pie.
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Re: Mensa Mind teaser

on Sun Mar 04 2018, 22:05
I have it, there is no solution to a negative square root.

The number is called an 'imaginary' number and is denoted by the letter 'i'.

I posted too early, should have thought it through.

I ate some pie.
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Re: Mensa Mind teaser

on Sun Mar 04 2018, 22:10
Lol There's no fooling you.
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Re: Mensa Mind teaser

on Wed Mar 07 2018, 19:01
If an item was on sale for a price that would make 
a profit of 50 %  but is then reduced by 10 % what
percent profit will be made if it sells at the new amount ?
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raymyjamie
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Re: Mensa Mind teaser

on Wed Mar 07 2018, 20:20
The profit will drop to 40%.
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Re: Mensa Mind teaser

on Wed Mar 07 2018, 23:01
The   reduction will be 10% of the 150% price so would result in a 35% profit.
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Re: Mensa Mind teaser

on Thu Mar 08 2018, 09:39
Close to it Ray
Spot on myg
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Re: Mensa Mind teaser

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