A "Dictionary of Idioms" is 30 yuan, which is 1.5 yuan more than three times the price of a "Composition Selection". How much is a copy of "Selected Compositions"?
一本《成语词典》30元，比一本《作文选》价钱的3倍还多1.5元．一本《作文选》多少元？
<gadget id="calculator">30 - 1.5</gadget>
<output>28.5</output>

<gadget id="calculator">28.5 / 3</gadget>
<output>9.5</output>

<result>9.5</result>