Aidan is doing a multiple choice test with 20 questions. he scores 3 marks for a correct answer and loses 1 mark if the answer is incorrect. aidan answers all the questions and scores 40 marks. how many answers has he answered correctly?

How much money does ron have left each month after his fixed expenses? ron graduated from college five years ago. he recently bought a house, but shares it with a housemate who pays him $800 a month for rent and utilities. ron is putting a budget worksheet together so he will have a better idea of where his money is going and where he can save. enlarge