Question

A stack of 1000 sheets of paper is 11.8 cm high. What is the thickness of each sheet ?

Answer 1

Given, stack is 11.8 cm high.
Stack contains paper arranged one above another. This means, height is equal to total thickness of 1000 paper together.

Now, we know,
Number of paper = 1000
Total thickness = 11.8cm

Let thickness of 1 paper be x cm.
So, thickness of 2 papers will be x+x=2x
Thickness of 5 papers will be x+x+x+x+x=5x.
Similarly
Thickness of 1000 papers will be 1000x.

Given, total thickness = 11.8cm

Equating both,
1000x = 11.8 cm
x = 11.8 ÷ 1000 cm = 0.0118cm.

Hence, thickness of one paper = x = 0.0118cm = 0.118mm


Or... Directly you can use another method.

Given,
Thickness of 1000 paper = 11.8cm
So, thickness of 1 paper = 11.8/1000=0.0118cm.