Step-by-step explanation:
Meli: 4/12
Her friend: 3/4
so,
(4/12) + (3/4)= 13/12 → 1 whole and 1/12
Let the water melon be 1:
1- 13/12 = -1/12 (NOT POSSIBLE)
Therefore, none was left because the Meli and her friends have finished an entire water melon already.