Answer :
Monday = 3
Tuesday = 3 × 3 = 9
Wednesday = 9 × 3 = 27
Thursday = 27 × 3 = 81
Tim read 81 pages on Thursday
Tuesday = 3 × 3 = 9
Wednesday = 9 × 3 = 27
Thursday = 27 × 3 = 81
Tim read 81 pages on Thursday