Question

Gerald reads 120 pages of a book in 4 days. If he always reads 6 more pages than the previous day,find the number of pages he reads on the first day.
arithmetic sequence with d = 6
and sum of 4 terms = 120

(4/2)(2a + 3d) = 120
2(2a + 18) = 120
2a + 18 = 60
2a = 42
a = 21

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