Add salt to 4.5 kg of water to make brine with a salt content of 10%. If the brine contains 8% salt, how many kg of water should be added?
在4.5千克水中加盐，配制成含盐10%的盐水，如果要是盐水中含盐8%，那么，应该加水多少千克．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">4.5 / (9/10)</gadget>
<output>5</output>

<gadget id="calculator">5 - 4.5</gadget>
<output>0.5</output>

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

<gadget id="calculator">0.5 / (2/25)</gadget>
<output>6.25</output>

<gadget id="calculator">6.25 - 4.5 - 0.5</gadget>
<output>1.25</output>

<result>1.25</result>