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Working backwards,
20 + 2 = 22
2/3 ——-> 22
3/3 ——-> 33 (number of marbles before Aziz took 1/3 of the remaining marbles and another 2 marbles.)
33 + 7 = 40
2/3 ——-> 40
3/3 ——-> 60 (number of marbles before Ben took 1/3 of the remaining marbles and another 7 marbles )
60 + 4 = 64
2/3 ——-> 64
3/3 ——-> 96

Ans : 96 marbles.

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