The sixth grade students participated in the tree planting activity. 90 trees survived and 10 trees did not survive. What is the survival rate?
六年级同学参加植树活动，成活90棵，10棵没有成活，成活率是多少．
<gadget id="calculator">90 + 10</gadget>
<output>100</output>

<gadget id="calculator">90 / 100</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>