There are 99 boys in the fifth grade, and there are more girls than boys (1/11). What is the difference between boys and girls in this grade?
五年级有男生99人，女生人数比男生多(1/11)，这个年级男、女生相差多少人
<gadget id="calculator">1 / 11</gadget>
<output>1/11 = around 0.090909</output>

<gadget id="calculator">99 * (1/11)</gadget>
<output>9</output>

<result>9</result>