The school library bought a batch of new books, including 38 popular science books and 67 literature and art books. The number of story books was three times the sum of science books and literature and art books. How many story books did the school buy?
学校图书馆买来一批新书，其中科普书有38本，文艺书有67本，故事书的本数是科普书和文艺书本数之和的3倍，学校买来故事书多少本？
<gadget id="calculator">38 + 67</gadget>
<output>105</output>

<gadget id="calculator">105 * 3</gadget>
<output>315</output>

<result>315</result>