certain class planted trees on a mountain, and planted 175 trees, 25 of which died, and 25 were replaced, and all of them survived. What is the survival rate of this tree planting?
某班到山上种树，种了175棵树，死了25棵，又补上了25棵，全活了，这次种树的成活率是多少．
<gadget id="calculator">175 - 25</gadget>
<output>150</output>

<gadget id="calculator">150 + 25</gadget>
<output>175</output>

<gadget id="calculator">175 + 25</gadget>
<output>200</output>

<gadget id="calculator">175 / 200</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(7/8) * 1</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>