Put 30g of salt into 120g of water, what is the percentage of salt in the salt water?
把30g盐放入120g水中，盐占盐水的多少．
<gadget id="calculator">30 + 120</gadget>
<output>150</output>

<gadget id="calculator">30 / 150</gadget>
<output>1/5 = around 0.2</output>

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