Two cartons are the same as 1 wooden cases, that is, they are all converted into wooden cases: 6/2=3 * * with wooden cases 2+3=5. Each wooden case contains 300/5=60. Then 60/2=30 per case. Each wooden case contains 60-30 cases more than cartons.

Wooden cases are converted into cartons, 2× 2 = 4 6+4 = 10, each containing 300 pairs10 = 30 pairs, each containing 30× 2 = 60 pairs.