To prepare a salt water, add 7 grams of salt per 100 grams of water, what is the mass of salt in this salt water to the salt water
要配制一种盐水，每100克水中要加入7克盐，这种盐水中盐的质量占盐水的多少
<gadget id="calculator">100 + 7</gadget>
<output>107</output>

<gadget id="calculator">7 / 107</gadget>
<output>7/107 = around 0.065421</output>

<result>7/107 = around 0.065421</result>