0 like 0 dislike
A boy arranges exercise books in piles. The first pile has 2 exercise books. The second pile has 5 exercise books. The third pile has 8 exercise books. The eighth pile has 22 exercise books. If the boy continues arrangig exercise books this way, calculate the total number of exercise books used if he has arranged 25 piles.
in Grade 12 Maths by Platinum (113k points) | 28 views

1 Answer

0 like 0 dislike
This is a real life number pattern with terms, 2,5,8, ...,22,....25


d=3, arithmetic sequence

We have to find the sum of books given 25 as the number of  terms(piles)

Sn  = n/2 x [2a+(n-1)d]

       = 25/2 x [2x2+(25-1)3]

        = 950 books
by Diamond (85.5k points)
Welcome to MathsGee Open Question and Answer Bank, a platform, where you can ask Maths and Science questions and receive answers from other members of the community. Help is always 100% FREE!
MathsGee QnA is the knowledge-sharing community where millions of students and experts put their heads together to crack their toughest homework questions.

Enter your email address: