Barrel A contains 85 kg of oil and Barrel B contains 58 kg of oil. How many kilograms of oil are poured into barrel B from barrel A so that the oil in the two barrels is exactly equal? (solution with equation)
甲桶有油85千克，乙桶有油58千克．从甲桶倒入乙桶多少千克油，两桶里的油正好相等？(用方程解答)
<gadget id="calculator">85 - 58</gadget>
<output>27</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">27 / 2</gadget>
<output>27/2 = around 13.5</output>

<result>27/2 = around 13.5</result>