To prepare a potion, the weight ratio of medicine to water is 1:100. Xiao Ming is going to use 10 grams of potion with a drug content of 75% to prepare this potion. How many grams of water should be added?
配制一种药水，药与水的重量比是1：100，小明准备用含药量为75%的药水10克配制这种药水，需加水多少克？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">10 * (3/4)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">(15/2) / (1/100)</gadget>
<output>750</output>

<gadget id="calculator">10 - (15/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">750 - (5/2)</gadget>
<output>1_495/2 = around 747.5</output>

<result>1_495/2 = around 747.5</result>