Question

____x15=30

are you suppose to ( - ) the to numbers

Answer 1

2x15=30

Answer 2

basically multiplication and division are a package deal, and so are subtraction and addition. since you have ___ x 15= 30, you'll want to sort of vice versa the situation and use division, so 30/15=?
if the question was ___ + 15 = 30, your other half of the package deal is subtraction, right? so it would be 30 - 15 = ?
I hope this makes sense