The sixth grade donated 240 yuan to Yushu, 30 yuan less than the three times of the first grade. How much did the first grade donate to Yushu?
六年级给玉树捐款240元，比一年级的3倍少30元，一年级给玉树捐款多少元？
<gadget id="calculator">240 - 30</gadget>
<output>210</output>

<gadget id="calculator">210 / 3</gadget>
<output>70</output>

<result>70</result>