Question 157985
1) Let the left page number be x, then the next consecutive right page number is x+1.
You are told that the sum of these two numbers is 469, so you can write the equation:
x+(x+1) = 469 
2x+1 = 469 Subtract 1 from both sides.
2x = 468 Divide both sides by 2.
x = 234 and (x+1) = 235
The page numbers  are: 234 and 235
2) The product of twice a number and 3 ((2n)*3) is the same as (=) the difference of 5 times the number and 3/4 (5n-3/4).
You can express this as:
(2n)*3 = 5n-3/4 Simplify.
6n = 5n-3/4 Subtract 5n from both sides.
n = -3/4
The number is -3/4
3) The sum of three consecutive integers is 99. This can be expressed as:
x+(x+1)+(x+2) = 99 Simplify.
3x+3 = 99 Subtract 3 from both sides.
3x = 96 Divide both sides by 3.
x = 32
The code for Belgium is 32.
The code for France is 33.
The code for Spain is 34