In 1520 kg of brine, the salinity rate is 25%, and these brines should be turned into 50% brine. How many kilograms of water need to be evaporated?
1520千克的盐水中，含盐率为25%，要使这些盐水变为含盐率为50%的盐水．需要蒸发掉多少千克水？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/4) / (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1_520 * (1/2)</gadget>
<output>760</output>

<gadget id="calculator">1_520 - 760</gadget>
<output>760</output>

<result>760</result>