According to the ratio of salt and water is 1:19 to prepare a kind of salt water, this salt water has 500 grams, how many grams of salt are therein?
按盐和水的比为1：19配制一种盐水，这种盐水有500克，其中盐有多少克．
<gadget id="calculator">1 + 19</gadget>
<output>20</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">500 * (1/20)</gadget>
<output>25</output>

<result>25</result>