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Seven times to emphasize high mathematics.
If the number of boys is z, the number of girls is 6/5z, the average weight of girls is y, and the average weight of boys is 6/5Y.

The total weight of a class =6/5zy+z6/5y=zy 12/5.

Average weight 48=zy 12/5 divided by 1 1/5z.

48=Y 12/ 1 1

Y=44

So the average weight of girls is 44, and that of boys is 6/5Y=52.8.

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