Quadradic Equation Word Problems - Examples & Practice

Tony is planning a school field trip and needs to figure out how many buses he should have to drive his class. He figures out the number of buses $b$ follows the equation, $2b^2=9b-9$. He also knows that the amount of kids $k$ that can fit on each bus follows the equation, $k^2-18k=360$. How many students can Tony bring on the field trip?