The students donated books to the children in the disaster-stricken area of Ya'an, Sichuan. The number of books donated by the fourth grade is 12 less than that donated by the third grade. A total of 112 books were donated by the third grade. How many books were donated by the fourth grade?
同学们为四川雅安灾区的小朋友捐赠图书．四年级捐赠的图书比三年级捐赠的2倍少12本，三年级共捐赠了112本书，四年级捐赠了多少本图书？
<gadget id="calculator">112 * 2</gadget>
<output>224</output>

<gadget id="calculator">224 - 12</gadget>
<output>212</output>

<result>212</result>