Containers A and B are filled with the same water, and 0.3 liters of water is poured out of container A each time. Pour out 0.5 liters of water from container B. After several times, there are 1.7 liters of water left in container A, and 0.3 liters of water in container B. How much water was originally contained in container A?
甲、乙两容器装有同样的水，每次从甲容器中倒出0.3升水．从乙容器中倒出0.5升水，若干次后，甲容器还剩1.7升水，乙容器还剩0.3升水，原来甲容器中装有多少水？
<gadget id="calculator">1.7 - 0.3</gadget>
<output>1.4</output>

<gadget id="calculator">0.5 - 0.3</gadget>
<output>0.2</output>

<gadget id="calculator">1.4 / 0.2</gadget>
<output>7</output>

<gadget id="calculator">7 * 0.3</gadget>
<output>2.1</output>

<gadget id="calculator">2.1 + 1.7</gadget>
<output>3.8</output>

<result>3.8</result>