A glass of 100% salt water with a concentration of 100g, after adding a part of water, the concentration becomes 8%. How many grams of water was added?
一杯浓度为10%的盐水100克，加入一部分水以后，浓度变为8%．问加入了多少克水？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 * (1/10)</gadget>
<output>10</output>

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

<gadget id="calculator">10 / (2/25)</gadget>
<output>125</output>

<gadget id="calculator">125 - 100</gadget>
<output>25</output>

<result>25</result>