There are 80 kg of brine containing 6% salt, and to prepare 150 kg of brine containing 20% salt, how many kg of salt should be added?
有含盐6%的盐水80千克，要配制含盐20%的盐水150千克，需加盐多少千克？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<gadget id="calculator">6 / 100</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">80 * (3/50)</gadget>
<output>24/5 = around 4.8</output>

<gadget id="calculator">30 - (24/5)</gadget>
<output>126/5 = around 25.2</output>

<result>126/5 = around 25.2</result>