A salt water, the ratio of salt and water is 1:99. To make such salt water, how many grams of salt should be put into 990 grams of water.
一种盐水，盐和水的比是1：99．要配成这样的盐水，990克水中需要放入多少克盐．
<gadget id="calculator">1 / 99</gadget>
<output>1/99 = around 0.010101</output>

<gadget id="calculator">(1/99) * 990</gadget>
<output>10</output>

<result>10</result>