Mr. nail has a box of clarinets. He has a total of 42 objects. He has 12 mouthpieces. He has four times as many reads as neck straps. How many of each object does he have? Use reasoning to write an expression then solve. I’m in fifth grade and I have no idea what this means if you guys could help me with it at least three hours thank you

If there are r reeds and n neckstraps, then

The total of all objects (including the 12 clarinets) is
r+n+12 = 42
but r = 4n, so
4n+n+12=42
5n=30
n=6
so there are
12 clarinets
6 neckstraps
24 reeds