A cup of sugar water is 720 grams, the ratio of sugar to water is 1:35, how many grams of sugar are added, the ratio of sugar to water is 1:20.
一杯糖水720克，糖和水的比是1：35，再加入多少克糖，糖和水的比是1：20．
<gadget id="calculator">1 + 35</gadget>
<output>36</output>

<gadget id="calculator">720 / 36</gadget>
<output>20</output>

<gadget id="calculator">35 / 20</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">20 * 1 * (7/4) * 1 * 1</gadget>
<output>35</output>

<gadget id="calculator">20 * 1</gadget>
<output>20</output>

<gadget id="calculator">35 - 20</gadget>
<output>15</output>

<result>15</result>