Lingfei Education and Training School used to use an average of 150 degrees of electricity per day for lighting. After switching to energy-saving lamps, it only uses an average of 30 degrees per day. Question: How many days can I use the electricity used for a week now? (Solve with ratio)
灵飞教育培训学校原来平均每天照明用电150度，改用节能灯后，平均每天只用30度，问：原来一个星期的用电量，现在可以用多少天？(用比例解)
<gadget id="calculator">150 * 7</gadget>
<output>1_050</output>

<gadget id="calculator">1_050 / 30</gadget>
<output>35</output>

<result>35</result>