Students in grade six planted 60 trees, and the survival rate was 85%. How many trees did not survive?
六年级同学植树60棵，成活率是85%，没有成活的树有多少棵．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">60 * (3/20)</gadget>
<output>9</output>

<result>9</result>