Now we need 0.6% salt water to do seed germination test, and we have 15 grams of 5% salt water, how many grams of water should be added to make it successfully.
现在需要0.6%的盐水做种子发芽试验，现有5%的盐水15克，应加多少克水才能配制成功．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">15 * (1/20)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">0.6 / 100</gadget>
<output>0.006</output>

<gadget id="calculator">(3/4) / 0.006</gadget>
<output>125</output>

<gadget id="calculator">125 - 15</gadget>
<output>110</output>

<result>110</result>