Fill the tank with water in the morning, use up 20% of it during the day, use up another 27 liters in the evening, and use up the remaining 10% in the evening, and finally the remaining water is 1 liter more than half the tank. How many liters of water do you fill the tank with in the morning?
早上水缸里放满了水，白天用去了其中的20%，傍晚又用去了27升，晚上又用去剩下水的10%，最后剩下的水比半缸水多1升．早上放满水缸水有多少升？
<gadget id="calculator">27 * 0.9</gadget>
<output>24.3</output>

<gadget id="calculator">24.3 + 1</gadget>
<output>25.3</output>

<gadget id="calculator">0.8 * 0.9</gadget>
<output>0.72</output>

<gadget id="calculator">0.72 - 0.5</gadget>
<output>0.22</output>

<gadget id="calculator">25.3 / 0.22</gadget>
<output>115</output>

<result>115</result>