A bucket of salt water weighs 200 kilograms and has a salt content of 10%. How many kilograms of water must be evaporated to make the salt content reach 16%?
一桶盐水，重200千克，含盐率是10%，要使含盐率达到16%，要蒸发掉多少千克水？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">200 * (1/10)</gadget>
<output>20</output>

<gadget id="calculator">32 - 20</gadget>
<output>12</output>

<gadget id="calculator">12 / 0.16</gadget>
<output>75</output>

<result>75</result>