To configure a kind of salt water, 3 grams of salt should be added to every 100 grams of water. In this kind of salt water, how much is the mass of salt in the salt water?
配置一种盐水，每100克水中要加入3克盐，这种盐水中，盐的质量占盐水的多少
<gadget id="calculator">100 + 3</gadget>
<output>103</output>

<gadget id="calculator">3 / 103</gadget>
<output>3/103 = around 0.029126</output>

<result>3/103 = around 0.029126</result>