Weighing Scales


A set of weighing scales measures weight in kilograms. A boy, a girl, and a dog stand on the scales in three different ways.

How heavy would the boy, girl, and dog weigh together?


Let the weight of the boy, girl, and dog be b, g and d respectively.

b + g = 118, g + d = 72, b + d = 78

Adding all three equations: 2b + 2g + 2d = 268.

Hence the weight of all three, b + g + d = 134 kg.

How heavy would each be individually?

Problem ID: 81 (Oct 2002)     Difficulty: 1 Star

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