The green team planted a total of 25 trees, but 4 of them did not survive. What is the survival rate of these trees?
绿色小队共植树25棵，有4棵没有成活，这批树的成活率是多少．
<gadget id="calculator">25 - 4</gadget>
<output>21</output>

<gadget id="calculator">21 / 25</gadget>
<output>21/25 = around 0.84</output>

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

<gadget id="calculator">(21/25) * 1</gadget>
<output>21/25 = around 0.84</output>

<result>21/25 = around 0.84</result>