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Math Beijing Normal University Edition Exercise Book Answer (Grade 6 Volume 1) P26
Suppose that laughter and naughty have x and y yuan respectively.

5/6x+ 1/5( 1/6x+y)= 120

4/5(y+ 1/6x)= 120

X= 108，y= 132，

In other words, Xiaoxiao originally had 108 yuan, and Naughty originally had 132 yuan.

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