## November 17, 2010

### if a 0.1mm paper is folded 100 times...

if a 0.1mm paper is folded 100 times then what will be the thickness
of it after 100 foldings?

André Meneses said...

0.1mm :P

Ólafur said...

0.1 * 2^100 = 12.676.506.002.282.300.000.000
Km

viji said...

it cannot be folded after 8 times viji

Secret Squïrrel said...

Hah, all of the above! Altho', Ólafur, you need to use a more accurate calculator - should be 126,765,060,022,822,940,149,670.3205376Km.

You could also argue that the thickness is 0.2mm each time you fold it if you allow for it to be unfolded after every fold.

Anonymous said...

you can't fold more than 8 times.....

reason physics concept

Anonymous said...

10 mm if you could fold it a hundred times.

Tiago Ferreira said...

0.1*2^100=
126765060022822940149670320537,6 mm

maria said...

it vil increase 100 times of current thickness

Babu vincent said...

0.1mm*100 + 0.1mm

James said...

The paper is still .1 mm no matter how many times you fold it

grant said...

(2^100).1
to lazy to do the math but thats the equasion

jd2718 said...

I got it to 1m, but then it was too thick to fold even one more time, and there were 87 folds left

Anonymous said...

Actually its (2^99).1 mm . Cuz it takes one fold to make it 0.2mm thick. And I do belive you can fold something as many times as you want, as long as you're not the big blind.

Ajay said...

I have one puzzle.
12 = 1 + 2 = 3
345 = 3 + 4 + 5 = 12 = 1 + 2 = 3
576 = 18 = 9
Find digit of the sum in single digit.

How many numbers are there between 0 to 123456789 whose sum of digit is 5?

Ajay said...

Babu vincent said...

0.1mm

Babu vincent said...

0.1mm

Babu vincent said...

0.1mm

Ashwin Kumar said...

Thiss one's is easy if you look at the question.
I didn't even need a calculator.
They have not mentioned that we have to fold the paper in half. So, technically, we could just turn the edge over, and it would count as a fold.
Thus we have 100 folds, each 0.1 mm thick, making a total of 0.1x100=10 mm.
You can thank me later.