After adopting energy-saving measures, a building consumes 90 degrees of electricity every day. In this way, the electricity used for 18 days can now be used for 30 days. How much electricity does the building save every day compared to the original?
采用节能措施后，某大楼每天用电90度．这样原来18天用的电，现在可以用30天．该大楼现在每天比原来节约用电多少度？
<gadget id="calculator">30 / 18</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">90 * (5/3)</gadget>
<output>150</output>

<gadget id="calculator">150 - 90</gadget>
<output>60</output>

<result>60</result>