The student cafeteria used 150 kilograms of rice on Tuesday, 18 kilograms less than the rice used on Monday. What fraction of the rice used on Tuesday was used on Monday?
学生食堂星期二用去大米150千克，比星期一用去的大米少18千克．星期二用去的大米占星期一的几分之几？
<gadget id="calculator">150 + 18</gadget>
<output>168</output>

<gadget id="calculator">150 / 168</gadget>
<output>25/28 = around 0.892857</output>

<result>25/28 = around 0.892857</result>