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Answer of 24 gms seems to be correct.  If some one says it not right, then he/she is probably wrong.

Reaction :

   4 Al + 3 O₂  ==>  2 Al₂ O₃

Atomic weight of Aluminum = 27
Atomic weight of Oxygen = 16

So 108 gms of Aluminum reacts with 96 grams of Oxygen to completely burn and become an oxide.

Hence, 27 grams of Aluminum reacts with 24 grams of Oxygen.

4 moles of Al  reacts with 3 moles of  Oxygen.  Or, One mole of Al reacts with  0.75 mole of Oxygen.

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