Question

After a work luncheon, Sara brought home 5/9 of a cheese
pizza. Later that night, Sara ate 2/12 of the cheese pizza. How
much of the cheese pizza remained?

Answer 1

5/9-2/12=?

9x8=72
5x8=40

12x6=72
2x6=12

40/72 - 12/72 = 28/72

28/4=7
72/4=18

28/72=7/18