Two barrels of oil, A and B, have a total of 450 kilograms. After pouring oil (1/6) from barrel A into barrel B, the ratio of oil in barrels A and B is 4:5. How many kilograms of oil is poured into barrel A?
甲、乙两桶油共450千克，把甲桶油(1/6)倒入乙桶后，甲、乙两桶油的比是4：5，甲桶倒了多少千克油给乙桶？
<gadget id="calculator">450 * 4</gadget>
<output>1_800</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 4</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(1/6) * 5</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">5 - (2/3) - (5/6)</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">4 + (7/2)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">1_800 / (15/2)</gadget>
<output>240</output>

<gadget id="calculator">240 * (1/6)</gadget>
<output>40</output>

<result>40</result>