There are 100g in a cup of salt water, and the ratio of salt to water is 1:9. If you add 20g of salt in water, how much does the salt account for in the salt water?
一杯盐水有100g，盐与水的比是1：9，如果再加水20g盐，这时盐占盐水的多少．
<gadget id="calculator">1 + 9</gadget>
<output>10</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 * (1/10)</gadget>
<output>10</output>

<gadget id="calculator">10 + 20</gadget>
<output>30</output>

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

<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>