Huayuan Primary School planted 185 trees this year, 15 of which failed to survive, and 15 were replanted later, all of which survived. What is the survival rate of the tree planting in Huayuan Primary School this year?
花园小学今年植树185棵，有15棵未成活，后来又补种15棵，全部成活．花园小学今年植树的成活率是多少．
<gadget id="calculator">185 - 15</gadget>
<output>170</output>

<gadget id="calculator">170 + 15</gadget>
<output>185</output>

<gadget id="calculator">185 + 15</gadget>
<output>200</output>

<gadget id="calculator">185 / 200</gadget>
<output>37/40 = around 0.925</output>

<result>37/40 = around 0.925</result>