To make a birthday cake requires 7.5 grams of cream and 250 grams of flour. The cake room uses 90 grams of cream a day. According to this calculation, how many kilograms of flour are used?
做一个生日蛋糕需要奶油7.5克，需要面粉250克．一天蛋糕房用去90克奶油，照这样计算，用去面粉多少千克？
<gadget id="calculator">250 / 7.5</gadget>
<output>33.333333</output>

<gadget id="calculator">90 / 1_000</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">33.333333 * (9/100)</gadget>
<output>3</output>

<result>3</result>