After adding a certain amount of water to a certain amount of brine, the concentration of the brine drops to 3%, and after adding the same amount of water, the concentration drops to 2%. Ask, if the same amount of water is added again, how much will the concentration drop to?
若干盐水加入一定量的水后，盐水浓度降到3%，再加入同样多的水后浓度降到2%，问，如果再加入同样多的水后浓度降到多少？
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(3/100) - (1/50)</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">(1/50) - (3/100)</gadget>
<output>-1/100 = around -0.01</output>

<gadget id="calculator">(1/50) + (-1/100)</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">(1/100) / (1/100)</gadget>
<output>1</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">(3/100) / 4</gadget>
<output>3/400 = around 0.0075</output>

<gadget id="calculator">2 * (3/400)</gadget>
<output>3/200 = around 0.015</output>

<result>3/200 = around 0.015</result>