Question
Emily and Kylie's total mass is 48 kg. Kylie and Xuan's total mass is 90 kg. Xuan is three times as heavy as Emily. What is the average mass of the three friends?
3 m

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Emily and Kylie's total mass is 48 kg. Kylie and Xuan's total mass is 90 kg. Xuan is three times as heavy as Emily. What is the average mass of the three friends?