0 24 H in a D
24 HOURS IN A DAY
1 5 P of I T
5 parts of Intelligence Tests
2 10 is 2 in B
10 is 2 in binary
3 X 360
XBOX 360
4 800x600 S R
800x600 Screen Resolution
5 A B and the 40 T
Ali Baba and the 40 Thieves
6 6 Z in a M
6 Zeros in a Million
7 22 P on a F F
22 Players on a Football Field
8 54 S on a R C
54 Squares on a Rubik's Cube
9 21 D on a S D
21 Dots on a Standard Die
10 4 W in a M
4 Weeks in a Month
11 The 9 M
The 9 Muses
12 12 D of J
12 Disciples of Jesus
13 The D to A C is A 4 L Y
The Distance to Alpha Centauri is Approximately 4 Light Years
14 121 S on a C C B
121 Spaces on a Chinese Checkers Board
15 9/11 A
9/11 Attacks
16 J has 62 M
Jupiter has 62 Moons
17 4 L on a T
4 Legs on a Table
18 2 B on a P of S
2 Blades on a Pair of Scissors
19 9 C of H in D I
9 Circles of Hell in Dante's Inferno
20 7 L in the W L
7 Letters in the Word Letters

Easy eh? We know you managed to get most of them. We'll try to make it harder next time :)