For a batch of wheat seeds, the ratio of the number of germinated grains to the number of ungerminated grains is 4:1, what is the germination rate?
一批小麦的种子，发芽粒数与没发芽粒数的比是4：1，发芽率是多少
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>