Prepare a kind of sugar water according to the mass ratio of sugar and water of 1:4, what is the sugar content of this sugar water?
按糖和水的质量比为1﹕4配制一种糖水，这种糖水的含糖率为多少．
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) * 1</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>