Xiao Ming and his 5 classmates planted trees, and each planted 4 trees. How many trees were planted in total?
小明和他的5个同学植树，每人栽了4棵，一共栽了多少棵？
<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<result>24</result>