A bag of white sugar uses 10% of the total for the first time, and 25 grams for the second time. The ratio of the weight used twice to the total weight is 1:4. How many grams does this bag of sugar weigh?
一袋白糖第一次用去总数的10%，第二次用了25克，两次用去的重量与总重量的比是1：4．这袋白糖重多少克？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/4) - (1/10)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">25 / (3/20)</gadget>
<output>500/3 = around 166.666667</output>

<result>500/3 = around 166.666667</result>