Mom buys a bottle of oil for frying mahua. The first time I use (3/10) kilograms, the second time I use the rest (3/4). There is still 0.2 kilograms of oil in the bottle. How many kilograms does this bottle of oil have? ?
妈妈买一瓶油用来炸麻花，第一次用去(3/10)千克，第二次用去余下的(3/4)，瓶内还有油0.2千克，这瓶油原来有多少千克？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">0.2 / (1/4)</gadget>
<output>0.8</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">0.8 + (3/10)</gadget>
<output>1.1</output>

<result>1.1</result>