Xiaoxin poured water for her mother to drink, and her mother drank 0.2 kg first, Xiaoxin poured in another 0.3 kg of water, and her mother drank another 0.15 kg, leaving 0.3 kg of water. How many kilograms of water did Xiaoxin pour for her mother?
小新倒水给妈妈喝，妈妈先喝了0.2千克，小新又倒进去0.3千克水，妈妈又喝了0.15千克，还剩0.3千克水．小新一共给妈妈倒了多少千克水？
<gadget id="calculator">0.3 - 0.3</gadget>
<output>0</output>

<gadget id="calculator">0.15 + 0 + 0.2 + 0.3</gadget>
<output>0.65</output>

<result>0.65</result>