For a barrel of oil, (4/5) kilograms are used up, and (5/6) kilograms are left. How many kilograms does the barrel of oil originally weigh? What is the correct column
一桶油，用去(4/5)千克，还剩(5/6)千克，这桶油原来重多少千克？正确的列式是多少
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(4/5) + (5/6)</gadget>
<output>49/30 = around 1.633333</output>

<result>49/30 = around 1.633333</result>