After the price of water for residents in a city is increased by 20%, it is 1.8 yuan per cubic meter. How much is the price per cubic meter before the price increase?
某市居民用水价格提高20%后，每立方米是1.8元．提价前每立方米的价格是多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1.8 / (6/5)</gadget>
<output>1.5</output>

<result>1.5</result>