KöMaL 2011 K308
A certain brand of breakfast cereal is sold in three boxes of different sizes that also have different colours: red, green and blue. The red box is 50% more expensive than the blue box and weighs 20% less than the green box. The green box weighs 50% more than the blue box and costs 25% more than the red box. Which box has the lowest price per kilogram?
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