There is 450 grams of sugar water with a sugar content of 15%. After adding some water, the sugar content is 13.5%. How many grams of water is added?
有一种含糖率为15%的糖水450克，现在加入一部分水后，这时的含糖率是13.5%，加入的水是多少克？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">450 * (3/20)</gadget>
<output>135/2 = around 67.5</output>

<gadget id="calculator">13.5 / 100</gadget>
<output>0.135</output>

<gadget id="calculator">450 * 0.135</gadget>
<output>60.75</output>

<gadget id="calculator">(135/2) - 60.75</gadget>
<output>6.75</output>

<gadget id="calculator">6.75 / 0.135</gadget>
<output>50</output>

<result>50</result>