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Molly started her Novemeber "Read-a Lot" money raising progamme on the first day of the month, at the top of page 63 of her very large book. She read 23 pages the first day, 30 pages the second, then 37 pages on November 3. She continued, reading 7 pages extra each day, until the end of the month. On what page did she finish?

 Feb 24, 2019
 #1
avatar+19686 
+3

Misread the question at first...

 

This is an arithmetic sequence to which the total is added to 63

 

Sn = n(a1+an)/2

an = a30 = a1+(n-1)d     =  23 + 29(7) = 226

 

Sn= 30(23+226)/2    +63=  page 3798

 Feb 24, 2019
edited by Guest  Feb 24, 2019
edited by Guest  Feb 24, 2019
 #2
avatar+104627 
+1

That IS  a big book  !!!!

 

 

cool cool cool

 Feb 24, 2019

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