In a tree planting activity, the fifth grade planted 123 trees, 21 trees less than the sixth grade (2/3), how many trees were planted in the sixth grade?
在一次植树活动中，五年级植树123棵，比六年级(2/3)少植21棵树，六年级植树多少棵？
<gadget id="calculator">21 + 123</gadget>
<output>144</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">144 / (2/3)</gadget>
<output>216</output>

<result>216</result>