Find this math problem on the process paper

⑴When 0lt; /p>

⑵ Because the water consumption in February was less than 25m3, it must have exceeded 15 cubic meters in March,

Because 2.4×40-9=87≠79.8, so it should not exceed 15m3 in February,

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Suppose the water consumption in February is X cubic meters,

1.8X 2.4(40-X)-9=79.8, ：40-12=28 cubic meters,

Answer: (omitted)