The Experimental Primary School donated books to students in mountainous areas. The fifth grade donated 248 books. The fifth grade donated 4 books more than twice as much as the fourth grade. How many books were donated by the fourth grade?
实验小学为山区同学捐书，五年级捐248本，五年级捐的是四年级的2倍还多4本，四年级捐多少本？
<gadget id="calculator">248 - 4</gadget>
<output>244</output>

<gadget id="calculator">244 / 2</gadget>
<output>122</output>

<result>122</result>