Students bought "Knowledge of Self-rescue from Fire Prevention for Teenagers". The purchase fee for the third grade was 750 yuan, and the purchase fee for the fourth grade was 912 yuan. The fourth grade bought 27 more books than the third grade. How much is the price of each book?
同学们买《少年防火自救知识》，三年级的购书款是750元，四年级的购书款是912元，四年级比三年级多买书27本．每本书的售价是多少元？
<gadget id="calculator">912 - 750</gadget>
<output>162</output>

<gadget id="calculator">162 / 27</gadget>
<output>6</output>

<result>6</result>