Solution:
Monica has a blue skirt means she possibly wearing that. Monica's skirt is the same to that of Rachael's means both of them are wearing blue skirt. These two sentences confirm that Monica is wearing a blue skirt.
Find the two statements that together prove;
“Monica is wearing blue skirt”
I: Monica has blue skirt.
II: Rachael love blue colour.
III: Rachael is wearing a blue skirt.
IV: Monica’s skirt is the same colour as Rachael’s.
Monica has a blue skirt means she possibly wearing that. Monica's skirt is the same to that of Rachael's means both of them are wearing blue skirt. These two sentences confirm that Monica is wearing a blue skirt.