There are 80 kilograms of sugar water with a concentration of 10%, how many kilograms of water need to be added to obtain sugar water with a concentration of 8%?
现有浓度为10%的糖水80千克，要想得到浓度为8%的糖水，需要加水多少千克？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">(1/10) / (2/25)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">80 * (5/4)</gadget>
<output>100</output>

<gadget id="calculator">100 - 80</gadget>
<output>20</output>

<result>20</result>