Solve word problems that involve linear inequalities in two variables.
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Problem

Nathaniel builds birds and birdhouses using lego blocks.
Let B represents the number of birds and H represents the number of birdhouses that Nathaniel can build with his lego blocks.
43, B, plus, 215, H, is less than or equal to, 3000
Nathaniel wants to build 50 birds using lego blocks. How many birdhouses can he build at most with the remaining lego blocks?
Please choose from one of the following options.