In the activity of offering love, the fifth grade donated 50 books, 2 times more than the fourth grade. How many books are donated by the two grades?
献爱心活动中，五年级捐图书50本，比四年级的2倍多2本．两个年级共捐图书多少本？
<gadget id="calculator">50 - 2</gadget>
<output>48</output>

<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<gadget id="calculator">50 + 24</gadget>
<output>74</output>

<result>74</result>