Uncle Wang planted a batch of saplings, 30 of which survived, and 10 did not survive. What is the survival rate of the batch of saplings planted by Uncle Wang?
王大伯种一批树苗，成活了30棵，没有成活的有10棵．王大伯种的这批树苗的成活率是多少？
<gadget id="calculator">30 + 10</gadget>
<output>40</output>

<gadget id="calculator">30 / 40</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) * 1</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>