The original salt in a glass bottle is water (1/11), after adding 21 grams of salt, the salt is salt water (1/9), how many grams of the original salt water in the bottle?
一个玻璃瓶内原有盐是水的(1/11)，加进21克盐后，盐是盐水的(1/9)，瓶内原有盐水多少克？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/9) * 21</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">21 - (7/3)</gadget>
<output>56/3 = around 18.666667</output>

<gadget id="calculator">(1/9) * 11</gadget>
<output>11/9 = around 1.222222</output>

<gadget id="calculator">(11/9) - 1</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(1/9) + (2/9)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(56/3) / (1/3)</gadget>
<output>56</output>

<gadget id="calculator">11 * 56</gadget>
<output>616</output>

<gadget id="calculator">56 + 616</gadget>
<output>672</output>

<result>672</result>