The school buys 156 science and technology books, and buys four times as many story books as science and technology books. How many story books and science books are bought altogether?
学校买科技书156本，买故事书是科技书的4倍，买故事书和科技书共多少本？
<gadget id="calculator">156 * 4</gadget>
<output>624</output>

<gadget id="calculator">624 + 156</gadget>
<output>780</output>

<result>780</result>