A and B have two barrels of gasoline with a total of 92 kg. If 15 kg of oil in barrel B is poured into barrel A, then the gasoline in barrel A is equal to three times the gasoline in barrel B. How much is the original gasoline in barrel A?
甲、乙两桶汽油共92千克．如果把乙桶中的油倒15千克给甲桶，那么这时甲桶中的汽油等于乙桶中的汽油的3倍．甲桶原有汽油多少千克．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">92 / 4</gadget>
<output>23</output>

<gadget id="calculator">3 * 23</gadget>
<output>69</output>

<gadget id="calculator">69 - 15</gadget>
<output>54</output>

<result>54</result>