Question

If the weight of 12 sheets of thick paper is 40 grams, how many sheets of the same paper would weigh 2.5 kilograms?

Answer 1

Let the number of sheets which weigh 2.5 kg be x.
We put the above information in the form of a table as shown below:

Number of sheets	12	x
Weight of sheets (in grams)	40	2500

More the number of sheets, the more would their weight be.
So, the number of sheets and their weights are directly proportional to each other.

So, `12/40 = x/2500`

or `(12 xx 2500)/40 = x`

or 750 = x

Thus, the required number of sheets of paper = 750.