There is 36% salt water in the cup, after pouring a certain amount of water, the concentration of salt water will be reduced to 30%. To dilute to a concentration of 24%, how many times the water added last time should be added.
杯中有浓度为36%的盐水，倒入一定量的水后，盐水的浓度降低到30%．若要稀释到浓度为24%，则再加入的水是上次所加水的多少倍．
<gadget id="calculator">36 / 100</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">100 * (9/25)</gadget>
<output>36</output>

<gadget id="calculator">24 / 100</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">36 / (6/25)</gadget>
<output>150</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">36 / (3/10)</gadget>
<output>120</output>

<gadget id="calculator">120 - 100</gadget>
<output>20</output>

<gadget id="calculator">150 - 100 - 20</gadget>
<output>30</output>

<gadget id="calculator">30 / 20</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>