Horatio sanded a dresser for 1 1/4 hours. then he stained the dresser for 2 1/3 hours. for numbers 15.a- 15c, select true or false for each statement.

15a. a common denominator of the mixed numbers is 12. ( true or false)

15b. the amount of time spent sanding the dresser can be rewritten as 1 3/12 hours. (true or false)

15c. horatio spent 1 1/6 hours longer staining the dresser than sanding it. (true or false)