SOLUTION: 4 boxes weigh <70 kg each. Solve the weight for each box using a scale that only weighs items overs 70kg. Combined weight of pairs of boxes are 84,85,87,88,90 and 91kgs. There are

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Question 730034: 4 boxes weigh <70 kg each. Solve the weight for each box using a scale that only weighs items overs 70kg. Combined weight of pairs of boxes are 84,85,87,88,90 and 91kgs. There are 6 pair of boxes. I know to solve for for one box and then substitute but am having a hard time with the equation
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