Question
The total mass of Ahmad and Sean is 72.9 kg. The total mass of Sean and Japheth is 51.1 kg. If the total mass of Ahmad and Japheth is 69 kg, find the mass of Japheth.
4 m

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The total mass of Ahmad and Sean is 72.9 kg. The total mass of Sean and Japheth is 51.1 kg. If the total mass of Ahmad and Japheth is 69 kg, find the mass of Japheth.