The sixth grade students carried out tree planting activities, 180 trees survived, and 20 trees did not survive. The survival rate is the most.
六年级同学开展植树活动，成活180棵，20棵没有成活．成活率最多少．
<gadget id="calculator">180 + 20</gadget>
<output>200</output>

<gadget id="calculator">180 / 200</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>