The garden workers planted 442 trees this year, 4 more than three times the number of trees planted last year. How many trees were planted last year?
园林工人今年植树442棵，比去年植树棵数的3倍还多4棵，去年植树多少棵？
<gadget id="calculator">442 - 4</gadget>
<output>438</output>

<gadget id="calculator">438 / 3</gadget>
<output>146</output>

<result>146</result>