An empty water jar, filled with water in the morning. 20% of it is used during the day, and another 29 liters are used in the evening. At this time, the water in the tank is 1 liter more than the half tank. Q: How many liters of water to put in the tank in the morning?
一只空水缸，早晨放满了水．白天用去其中的20%，傍晚又用去29升，这时水缸中的水比半缸多1升．问：早上放入水缸多少升水？
<gadget id="calculator">30 / 0.3</gadget>
<output>100</output>

<result>100</result>