The number of fifth-grade students in Yucai Primary School is 1.1 times that of the fourth-grade students. If the fourth-grade students transfer 20 more students, the number of students in the two grades will be the same. How many students are there in the fourth grade.
育才小学五年级学生人数是四年级学生人数的1.1倍，如果四年级学生再转来20人，则两个年级学生人数就一样多，原来四年级有学生多少人．
<gadget id="calculator">1.1 - 1</gadget>
<output>0.1</output>

<gadget id="calculator">20 / 0.1</gadget>
<output>200</output>

<result>200</result>