word problem

Asked by  | 23rd Feb, 2013, 03:02: PM

Expert Answer:

Let the price of each book by Rs x and the number of books bought be n   So, nx = 80 If he would have 4 more books,    i.e. (n+4)(x-1)  = 80 Solving nx-n+4x-4 = 80 Substituing for x 80-n + 4*80/n - 4 = 80 n2 +4n - 320 = 0 n2 +20n-16n - 320 = 0 (n+20) (n-16) = 0 Since, n cant be negative, i..e n = 16.    The person bought 16 books and price of each book was Rs 5. 

Aswered by  | 23rd Feb, 2013, 07:16: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.