Mary has read 1/3 of a 240-page book. How many pages does she still have to read to finish the book? What percent of the book does she still have to read?

3 answers

240 * ( 1 / 3 ) = 240 / 3 = 80

240 - 80 = 160

OR

1 - 1 / 3 = 3 / 3 - 1 / 3 = 2 / 3

240 * 2 / 3 = 480 / 3 = 160
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