Teacher Wang brought 600 yuan to buy story books as prizes for the students. After buying 20 books, there was 20 yuan left. How much is each storybook?
王老师带600元钱去买故事书给同学们做奖品，买了20本后，还剩20元钱．每本故事书多少钱？
<gadget id="calculator">600 - 20</gadget>
<output>580</output>

<gadget id="calculator">580 / 20</gadget>
<output>29</output>

<result>29</result>