Answer:
12 mouthpieces, 24 reeds, 6 neck straps
Step-by-step explanation:
42 objects - 12 mouthpieces
= 30 objects left consisting of reeds and neckstraps
4 times as many reeds as neckstraps
think of it as 5 groups, 4 are reeds and 1 of nexkstraps
so divide 30 by 5 to get 6 per part.
4 of those parts = 24
1 of the parts = 6
so reeds = 24
neckstraps is 6
mouthpieces = 12