This year's Arbor Day, the fifth grade planted 350 trees, which is 70% of the sixth grade. How many trees were planted in the sixth grade?
今年的植树节，五年级植树350棵，是六年级的70%，六年级植树多少棵？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">350 / (7/10)</gadget>
<output>500</output>

<result>500</result>