Question

THE SUM OF TWO FACING PAGE NUMBERS IN A BOOK IS 145.WHAT ARE THE TWO PAGE NUMBERS?

Answer 1

Let x = The lower page number 
x + 1 = The higher page number 
x + (x + 1) = 145
2x + 1 = 145
2x = 145 - 1 = 144
x = 144/2
x = 72
x + 1 = 73
The two page numbers are 72 and 73 

Answer 2

the two pages are always consecutive so-
let the pages be x,x+1
a/q
x+x+1=145
2x =145-1(we will shift 1 to other side and it will become negative)
2x  =144
x=144/2(2 will b shifted and will become divisor)
x=72
therefore x=72 and x+1=73