There are 3 grams of salt and 100 grams of water in the brine, if you add 2 grams of salt, how much is the salt in the brine
盐水中有3克盐和100克水，如果再加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>