There are more students who play ball on the playground than those who run (1/9), and there are 10 fewer students who run than those who play ball. How many students are there who play ball?
操场上打球的同学比跑步的多(1/9)，跑步的比打球的少10人，打球的同学有多少人．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">10 / (1/9)</gadget>
<output>90</output>

<gadget id="calculator">90 + 10</gadget>
<output>100</output>

<result>100</result>