A total of 20 trees were planted in the school this spring, and 18 survived. What is the survival rate of these trees?
今年春季学校共植树20棵，成活了18棵，这些树的成活率是多少．
<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>