To prepare a kind of salt water, add 5 grams of salt per 100 grams of water, what is the weight of salt in this salt water to the salt water
配制一种盐水，每100克水中加5克盐，这种盐水中盐的重量占盐水的多少
<gadget id="calculator">100 + 5</gadget>
<output>105</output>

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

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