The sixth grade students of Dongfeng Primary School planted 150 trees, and the fifth grade planted 20% less trees than the sixth grade. How many trees were planted in the fifth grade?
东风小学六年级学生植树150棵，五年级比六年级植树少20%，五年级植树多少棵？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">150 * (4/5)</gadget>
<output>120</output>

<result>120</result>