This Math quiz is called 'Direct and Inverse Variation' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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What happens to the area of a square if you double the length of each side? Or the volume of a balloon, if the radius doubles? Questions like this can be modeled using variation – how does one variable change in relation to another one? There is a standard approach to solving these types of problems, see how good you are in this middle school Math quiz on direct and inverse variation.