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Simple math! Great god! 2 minutes at most!
According to the average 2 yuan/ton of 1 and 2, the specified tonnage should be greater than or equal to 10.

In March, the average 2 yuan was more than/ton, so it exceeded the specified tonnage in March and April.

1. If the specified tonnage is X, the excess is12-X..

2x+3( 12-x)=26

The solution is x= 10.

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