Question
The average weight of 7 pupils is 46 kg. When the weights of Japheth and Zane are included, the average weight becomes 46 kg. Zane is 4 kg lighter than Japheth. What is Japheth's weight?
3 m

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The average weight of 7 pupils is 46 kg. When the weights of Japheth and Zane are included, the average weight becomes 46 kg. Zane is 4 kg lighter than Japheth. What is Japheth's weight?