Question 1167426
The sum of two whole number is 45 and their difference is less than 10. The number of all the possible pair is
solution
x+y=45
x-y=9  solve both  x=27  y=18  (27,18) 
another pair 
similarly 
x+y=45
x-y=7  x=26 y=19     (26,19)  (25,20) (24,21)(23,22)
pair are (27,18)(26,19)(25,20)(24,21)(23,22)