The young pioneers planted 42 sunflowers in the fourth grade, and the number of sunflowers in the fifth grade was 1.5 times that of the fourth grade. How many trees were planted in the fourth and fifth grades?
少先队员种向日葵，四年级种了42棵，五年级种的棵数是四年级的1.5倍．四、五年级一共种了多少棵？
<gadget id="calculator">1 + 1.5</gadget>
<output>2.5</output>

<gadget id="calculator">42 * 2.5</gadget>
<output>105</output>

<result>105</result>