There are 25 kilograms of salt water, 20% salt, and 8% salt after adding some water, how much water is added?
有盐水25千克，含盐20%，加了一些水后含盐8%，加了多少水？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">(1/5) / (2/25)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">25 * (5/2)</gadget>
<output>125/2 = around 62.5</output>

<gadget id="calculator">(125/2) - 25</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>