A cup of sugar water, water accounts for (9/10) of the sugar water, and after adding 10 grams of sugar, water accounts for (9/11) of the sugar water. How many grams of sugar water is there? (solution by equation)
一杯糖水，水占糖水的(9/10)，再加入10克糖后，水占糖水的(9/11)．原来糖水有多少克？(用方程解)
<result>10</result>