A cement plant plans to produce a batch of cement in January. In fact, it has completed one third of the planned production in the first ten days, 40% of the planned production in the middle ten days, and another 26000 tons in the last ten days. As a result, it has exceeded the standard You know how many million tons of cement are planned to be produced in December? Don't solve the equation!

2.6÷(1+1/6-1/3-40%)
=2.6÷26/60
=6

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