Prepare a salt water. The weight ratio of salt to water is 1:31, how many grams of water should be added to 10 grams of salt?
配制一种盐水．盐和水的重量比是1：31，有盐10克应加水多少克．
<gadget id="calculator">10 * 31</gadget>
<output>310</output>

<result>310</result>