A bottle of milk, the first mouthful eats 15% of the whole, the second mouthful eats the remaining 10%, 3 grams more, the third mouthful eats the rest (1/5), and there are 120 grams left. This bottle of milk originally has How many grams?
一瓶牛奶，第一口吃了全部的15%，第二口吃了剩下的10%多3克，第三口吃了剩下的(1/5)，还剩120克，这瓶牛奶原来有多少克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">120 / (4/5)</gadget>
<output>150</output>

<gadget id="calculator">150 + 3</gadget>
<output>153</output>

<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">153 / (9/10)</gadget>
<output>170</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">170 / (17/20)</gadget>
<output>200</output>

<result>200</result>