There is a bottle of salt water with a salt content of 20%. After adding 8 grams of salt to this bottle of salt water, the salt content increases to 25%. So how many grams is this bottle of salt water?
有一瓶盐水，含盐量为20%，往这瓶盐水中加入8克盐后，含盐量提高到25%．那么原来这瓶盐水有多少克？
<gadget id="calculator">8 - 2</gadget>
<output>6</output>

<gadget id="calculator">0.25 - 0.2</gadget>
<output>0.05</output>

<gadget id="calculator">6 / 0.05</gadget>
<output>120</output>

<result>120</result>