Wanjiafu Supermarket bought a batch of Arowana oil, sold 2/3 of it on the first day, and sold out the remaining 15 barrels on the second day. How many barrels of this batch of Arowana oil are there?
万家福超市进了一批金龙鱼油，第一天卖了(2/3)，第二天把剩下的15桶全部卖完，这批金龙鱼油共有多少桶？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15 / (1/3)</gadget>
<output>45</output>

<result>45</result>