The school cafeteria planned to eat 3.6 kg of rice per day in October, but after adding teachers, it actually ate 4 kg per day. In the past, rice could be eaten for 30 days, how many days can it be eaten now?
学校食堂计划十月份每天吃3.6千克大米，后来增加了老师，实际每天吃4千克．原来可以吃30天的大米，现在可以吃多少天？
<gadget id="calculator">30 / 4</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">3.6 * (15/2)</gadget>
<output>27</output>

<result>27</result>