Problems and solutions of P99 page in the first volume of seventh grade mathematics published by People's Education Press. . Speed, 10 minutes plus points.

Each room is 52 square meters. The formula is: Class I can draw X square meters a day, Class II can draw x- 10 square meters a day, and a room is Y square meters. The formula is: 1 3x=8y-50。

Formula: 2. 5(x- 10)= 10y+40。

X=(8y-50)/3 comes from the formula 1.

According to formula 2, X=2y+ 18.

Then (8y-50)/3=2y+ 18 gives y=52 square meters.

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