We need a harder quiz, almost everybody is getting a perfect score. Sure we're all cat lovers, but there are subtler signals that cats send than those. Besides, two out of the four are joke answers half the time. Up your game, TCS!
Useful rule-of-thumb. My 13-pound DSH has ribs I can easily feel under a layer of fat, as you describe for ideal-weight cats, so I can stop wondering whether he weighs too much. He has a bit of a belly, but it is loose skin more than fat--I suppose some cats develop that as they age.
My vet...