The weight of objects in water will be lighter. Pure gold will lose one nineteenth of its weight in water, and pure silver will lose one tenth of its weight in water. There is a crown made of gold and silver which weighs 840 grams, which is reduced by 48 grams when placed in water. Find the gold content of the crown.
在水中的物体的重量都要减轻一些，纯金放在水中重量减轻十九分之一，纯银在水中要减轻十分之一．现有一顶金、银合成的皇冠重840克，放人水中减轻了48克，求皇冠的含金量．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">840 * (1/10)</gadget>
<output>84</output>

<gadget id="calculator">84 - 48</gadget>
<output>36</output>

<gadget id="calculator">1 / 19</gadget>
<output>1/19 = around 0.052632</output>

<gadget id="calculator">(1/10) - (1/19)</gadget>
<output>9/190 = around 0.047368</output>

<gadget id="calculator">36 / (9/190)</gadget>
<output>760</output>

<result>760</result>