This spring, the students participated in the tree planting activity. They planted 3 rows of pine trees, 8 trees in each row, and 5 rows of poplar trees, 15 trees in each row. How many pine trees and poplars were planted?
今天春天，同学们参加植树活动，共植松树3行，每行8棵；杨树5行，每行15棵．松树和杨树共植了多少棵？
<gadget id="calculator">3 * 8</gadget>
<output>24</output>

<gadget id="calculator">5 * 15</gadget>
<output>75</output>

<gadget id="calculator">24 + 75</gadget>
<output>99</output>

<result>99</result>