"G must be in H only if.."

lsatlover-1

Hello! I don't remember what practice test I took, but I saw a different type of logic game question. It said something along the lines of "G must be in H only if..". I am only used to the "If G is in H, what must be true?" Does anyone have tips on how to answer the "G must be in H only if.." questions? Thank you!

nicoco715

not sure if my way is the quickest, but I usually just work backwards on those questions. So I try the answer choice then apply the G must be in H. So I go through the answer choices and find out which one gives me G must be in H. Working backwards is the best method for me. If there's a better and more efficient way out there please let me know!