if a 36 cm thread is used to wrap a book , lengthwise twice and breadthwise once, what is the size of the book?

2 Answers on this Question

1. @ Aprameya Shyam
   length=x does not imply breadth=36-x
   2x+4y=36.
   3 possible answers are
   (2,8) -> 16sqcm.
   (4,7) -> 28sqcm.
   (6,6) -> 36sqcm

   Reply

2. length of the book = x
   width of a book = y
   4x + 2y = 36
   (one wrap covers both side length of the book same in width
   also – so two wrap covers 4x as well as in 2y)
   4(6)+ 2(6)=36
   4(7)+2(4) =36
   4(8)+2(2)=36
   are the possible roots…. second shud be the answer
   because that parameters are ideal for a book.
   7 x 4 is the size of book

   Reply