Three boys agree to divide a bag of marbles in the following manner. The first boy takes one more than half the marbles. The second takes a third of the number remaining. The third boy finds that he is left with twice as many marbles as the second boy. The original number of marbles is-

Bangladesh Bank বাংলাদেশ ব্যাংক — সহকারী পরিচালক (AD) (20-10-2023) গণিত 2023