有甲乙两桶花生油,甲桶有45千克,从乙桶倒出20%给甲桶后,乙桶比甲桶少3千克,乙桶原有花生油多少千克?

A = 45
B * (100%-20%) = A + (20%)B - 3
0.8B = A + 0.2B - 3
0.6B = A - 3
0.6B = 45 - 3
B = 42 / 0.6
B = 70
乙桶原有花生油70千克
请检查,若验算得出正确的话,