Question

If sthe weight of 12 sheets of thick paper is 40 grams, how many sheets of the same paper would weigh 2$\frac{1}{2}$ kilograms?

Answer 1

Given weight of $12$ sheets is $40$ grams

$⟹$ weight of each sheet is $\frac{40}{12}=\frac{10}{3}$ grams

Let the number of sheets that weight $2\frac{1}{2}$ kg be $x$

as we know that

weight of $x$ sheets is $\frac{10}{3}x$ grams

$⟹\frac{10}{3}x=2\frac{1}{2}\times 1000$

$⟹x=\frac{3}{10}\times \frac{5}{2}\times 1000=750$

So number of sheets is $750$