3 grams of salt is dissolved in 12 grams of water, and the salt accounts for ((())/(())) of the brine.
3克盐溶解在12克水中，盐占盐水的((())/(()))．
<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

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