Question

Tara would like to finish 2/5 of her book by next Friday.If the book has 203 pages,about how many pages does she need to read?

Answer 1

2/5 of 100 is 40, multiply that by two and you get 80/200. 80 pages. 

Answer 2

To get the answer we can use proportion
2/5 ------------------ 203
3/5 ------------------ x
crossmultiply now
3/5*203=2/5*x
$\frac{609}{5} = \frac{2}{5} x \\ 609=2x \\ x=304.5$ - its the answer