5g Tryptone / Liter
10g NaCl / Liter
5g Yeast Extract / Liter
15g Agar / Liter
To make LB Agar plates mix 40 g with 1 Liter of Deionized water and autoclave. 1 Liter makes ~35-40 Plates. You can find sterile plates Here.
A tutorial for making plates can be found Here