The school library bought 5 sets of "Children's Science Complete Book", 6 books in each set, and 15 yuan each. How much did you spend in total?
学校图书馆买了5套《少儿科学全书》，每套6本，每本15元，一共用了多少元？
<gadget id="calculator">15 * 6 * 5</gadget>
<output>450</output>

<result>450</result>