Joan’s stamp collection consists of three books. Two tenths of her stamps are on the first book, several sevenths are in the second, and there are 303 stamps in the third book. How many stamps are there in Joan’s collection?
2/10 are on the first book. 7/10 are on the second book. This means 1/10 is on the third book. 1/10 of the stamps is 303 stamps. Therefore, the total number of stamps are 3030.
