Mix 3 grams of salt and 100 grams of water to make brine. If an additional 2 grams of salt is added, how much does the salt make up of the brine
把3克盐和100克水混合成盐水．如果再增加2克盐，那么盐占盐水的多少
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">100 + 3 + 2</gadget>
<output>105</output>

<gadget id="calculator">5 / 105</gadget>
<output>1/21 = around 0.047619</output>

<result>1/21 = around 0.047619</result>