Put 5 grams of salt in 15 grams of water, what is the salt content?
把5克盐放入15克水中，含盐率是多少．
<gadget id="calculator">5 + 15</gadget>
<output>20</output>

<gadget id="calculator">5 / 20</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) * 1</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>