Question

if 18 notebooks cost rupees 333 how many notebooks can be purchased for rupees 425 point 50

Answer 1

In rupees 333,we can get 18 notebooks
In rupees 1 we can get notebook =18/333
In rupees 425.50,we can get notebook =
18x425.50/333=23 notebook (and)

Answer 2

$cost \: of \: 18 \: books = 333 \\ cost \: of \: 1 \: book = \frac{333}{18} = \frac{37}{2} \\ book \: for \: 425.50 = \frac{2}{37} \times 425.50 \\ = \frac{2 \times 42550}{3700} = \frac{85100}{3700} = \frac{851}{37} = 23$