On Sunday, Xiaohong's mother bought some candies and planned to go to the orphanage with Xiaohong to visit the children. Xiaohong divides these candies into small bags, and each bag is filled with 0.25 kg of toffee and 0.15 kg of fruit sugar. When 5.4 kilograms of fruit sugar is used, how many kilograms of toffee are used?
星期天，小红的妈妈买回一些糖果，准备与小红一起去孤儿院看望小朋友．小红将这些糖果分装在小袋中，每袋装入0.25千克奶糖和0.15千克水果糖．当水果糖用去5.4千克时，用去的奶糖有多少千克？
<gadget id="calculator">5.4 / 0.15</gadget>
<output>36</output>

<gadget id="calculator">36 * 0.25</gadget>
<output>9</output>

<result>9</result>