Xiaohong brings some money to buy candy. With the money he brings, if he buys milk candy, he can buy 4 kilograms; if he buys fruit candy, he can buy 6 kilograms. It is known that per kilogram of fruit candy is 4.5 yuan cheaper than per kilogram of milk candy, how much yuan did Xiaohong bring to buy candy?
小红带一些钱去买糖果，他带的钱如果买奶糖，可以买4千克；如果买水果糖，可以买6千克．已知每千克水果糖比每千克奶糖便宜4.5元，小红带了多少元去买糖果？
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">4.5 / 2</gadget>
<output>2.25</output>

<gadget id="calculator">4 * 2.25 * 6</gadget>
<output>54</output>

<result>54</result>