A brine is prepared by mixing salt and water in a ratio of 1:30. Among them, the weight of salt accounts for ((())/(())) of the salt water, and the weight of water accounts for how much of the salt water.
一种盐水是由盐和水按1：30的重量配制而成的．其中，盐的重量占盐水的((())/(()))，水的重量占盐水的多少．
<gadget id="calculator">1 + 30</gadget>
<output>31</output>

<gadget id="calculator">1 / 31</gadget>
<output>1/31 = around 0.032258</output>

<gadget id="calculator">1 / (1/31)</gadget>
<output>31</output>

<gadget id="calculator">30 / 31</gadget>
<output>30/31 = around 0.967742</output>

<result>30/31 = around 0.967742</result>