math at
posted by Tony .
Mary has read 1/3 of a 240page 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?

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