There are 253 students in the sixth grade of a certain school. The ratio of the number of boys to the number of girls is 6:5. How many girls are there?
某校六年级共有学生253人，男生人数和女生人数的比是6：5，女生有多少人？
<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">253 * (5/11)</gadget>
<output>115</output>

<result>115</result>