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Peanut yield per hectare
Assuming that the yield growth rate of new peanut varieties per hectare is X, the oil yield growth rate is 1/2x.

2000 *( 1+x)* 50% *( 1+x/2)= 1320

The solution is x=0.2 or x=-3.2 (excluding, the growth rate cannot be -3.2).

The yield per hectare of new peanut varieties has increased by 20%

Just list the equations according to the meaning of the question, and then remove the unrealistic results.

By the way, we did this problem not long ago. It's too difficult.