Question

Rico eats 1/9 of the lasagna, and his friend eats 1/18 of the lasagna. How much of the lasagna is left?

Answer 1

1/9+1/18=1/6 6/6-1/6=5/6 =5/6

Answer 2

Rico eats 2/18, his friend eats 1/18. 3/18 was eaten. 15/18 is left. or 5/6