Sunshine Primary School has an average of 118 students in grades 3, 4, and 5, and a total of 237 students in grades 4 and 5. How many students are there in grade 3?
阳光小学三、四、五年级平均每年级有118人，四、五年级共有237人，那么三年级有多少人．
<gadget id="calculator">118 * 3</gadget>
<output>354</output>

<gadget id="calculator">354 - 237</gadget>
<output>117</output>

<result>117</result>