There are 600 grams of salt water with a salt content of 8%. If it is to be converted into salt water with a salt content of 15%, how many grams of water should be evaporated?
有含盐率8%的食盐水600克，如果要使它成为含盐率为15%的食盐水，应蒸发掉多少克水．
<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(2/25) / (3/20)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">600 * (8/15)</gadget>
<output>320</output>

<gadget id="calculator">600 - 320</gadget>
<output>280</output>

<result>280</result>