What Was The Question? - Number Special

Four screens each with four questions that have the same answer but the question is missing information; can your class work out what information is missing? This is designed to create discussion (some questions have multiple answers possible and can be extended by asking students to find general solutions) and I intend to use these as starters. All these are number based questions involving fractions, percentages, ratio, directed numbers and more. I use these as starters; I put them on the board and students can get straight on with them upon their arrival.