If he wants the same amount of each item on the wreaths we need to find the factors of each to find the highest amount of wreaths he can make.
60=2×2×3×5=(2×2×3)×5
36=2×2×3×3=(2×2×3)×3
48=2×2×2×2×3=(2×2×3)×2×2
so 2×2×3 is in each which is equal to 12 so he can make 12 wreaths with remaining factors being the amount of each item.
12 wreaths
5 bows on each
3 silk roses each
4 silk carnations each