Fun with maths

[4GS]

Try this, dunno how it works perhaps a mathematician can help:

THINK OF A NUMBER BETWEEN 3 and 999.

Multiply it by 3.

Now add 5 to the result.

Take away the number you first thought of.

Now add 7.

Subtract 2.

Add back the number you first thought of.

Now, close your eyes ...
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Dark , isn't it?

[squarebear]

You're on a roll today! :o)

[tiggerblue10]

I closed my eyes and nearly nodded off! :-/

[whiffey]

It doesn't work, for example, 4 yields 22 and 5 yields 25, while for 6 there is no answer at all.

Might you have missed out a step ?

[bigmamma]

Grrrrr.......

[4GS]

errrrrrr
yeah, sorry 'bout that whiffey

curses
I didn't think anyone would notice ;-))

[funnygirl]

Something has gone wrong with mine!
I'll do it again. It does not help that I have had 3 glasses of wine!!!!! Hic.

[funnygirl]

Nope!

[tiggerblue10]

I got it straight away ;-)

[whiffey]

Got what ?

[tiggerblue10]

My insomnia was cured.

[funnygirl]

Ok, I'll do this slowiy
55 x 3 = 165
185 + 5 = 170
170 - 55 = 115
115 + 7 = 122
122 - 2 = 120
120 + 55 = 175

what have I done wrong???????

[whiffey]

You shouldn't have used 55 as it is a multiple of 11, and step 5 is obviously going to shaft it.

[4GS]

obviously
anyone can see that!!

[whiffey]

Idiots might not.

[funnygirl]

You calling me an idiot??!!!

[cazzz1975]

hmm, makes a change from gibbons I suppose?

[Lonnie]

Used to this at school, if i'm right, the answer is always half of the number you add on.

The way we did it, was think of a number, any number, double it, add on, eg 50, half the total,, now take away the number you thought of, and the answer should be 25

you can use any permutation, initial number, and any sytsem, provided you keep the sequence, the answer is always half the added on.

[Lonnie]

Hi John, sorry, That took me about 30mis to post. being pulled about by my daughter, then I re-read your post, I hadn't noticed your second add on, and on mine, also forgot a subtraction.