hope that the students in the fourth grade of elementary school will go to the countryside to plant trees. The students are divided into groups of 4 or 6, and they are all divided exactly. The number of students in the fourth grade is between 40 and 50. How many people are there in the fourth grade?
希望小学四年级的同学去农村植树．同学们按4人一组或6人一组，都正好分完．四年级人数在40至50人之间，四年级有多少人？
<gadget id="calculator">2 * 2 * 3</gadget>
<output>12</output>

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

<result>48</result>