The school carried out spring tree planting activities. A total of 300 trees were planted in the first class of four years, and the number of trees planted by the second class of four years was 15 times that of the first class of four years. How many trees were planted by the second class of four years?
学校开展春季植树活动，四年一班共植树300棵，四年二班是四年一班植树棵数的15倍，四年二班植树多少棵？
<gadget id="calculator">300 * 15</gadget>
<output>4_500</output>

<result>4_500</result>