The students planted trees in groups, the first group. Second Group. The ratio of the number of trees planted in the third group is 5:3:4, and the first group planted 20 trees. How many trees did the students plant in total?
同学们分组植树，第一组．第二组．第三组种树的棵数比是5：3：4，第一组种了20棵．同学们一共种了多少棵？
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">5 + 3 + 4</gadget>
<output>12</output>

<gadget id="calculator">4 * 12</gadget>
<output>48</output>

<result>48</result>