In March, Zhangqi Town Central Primary School planted camellias, of which 18 camellias survived and 2 camellias withered. Find the survival rate of these camellias.
三月份掌起镇中心小学种植茶花，其中18棵成活，2棵茶花枯死了，求这批茶花的成活率．
<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">18 / 20</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>