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Math·Algebra·Linear equations in two variables

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$$x+y=300$$The given equation relates the total number of bur oak trees, $x$, and the total number of other oak trees, $y$, planted in a 12-acre forest preserve. If 270 bur oak trees were planted in the forest preserve, how many other oak trees were planted in the forest preserve?

A

270

B

30

C

25

D

12