A pool is filled with water in the morning, 20% of the water is used in the morning, and another 29 liters are used in the afternoon. At this time, the water in the pool is 1 liter more than half of the water in the pool. How much water was filled in the pool in the morning?
一个水池早晨放满了水，上午用去这池水的20%，下午又用去29升，这时水池的水比半池水还多1升，这个水池早晨放了多少水？
<gadget id="calculator">29 + 1</gadget>
<output>30</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/2) - (1/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">30 / (3/10)</gadget>
<output>100</output>

<result>100</result>