There are three numbers A, B, and C. Take 15 from A and add it to B, then take 18 from B and add it to C, and finally take 12 from C and add it to A. At this time, the three numbers are 180 ． What is the original number of B?
有甲乙丙三个数，从甲数拿出15加到乙数，再从乙数拿出18加到丙数，最后从丙数拿出12加到甲数，这时三个数都是180．乙数原来是多少．
<gadget id="calculator">180 - 12</gadget>
<output>168</output>

<gadget id="calculator">168 + 15</gadget>
<output>183</output>

<result>183</result>