The students donated to the out-of-school children. The two classes of the third grade donated a total of 386 yuan, and the average donation of each of the three classes was 138 yuan. How much did the third grade donate in total?
同学们捐助失学儿童，三年级两个班共捐款386元，三个班平均每班捐款138元．三年级一共捐款多少元？
<gadget id="calculator">138 * 3</gadget>
<output>414</output>

<result>414</result>