Solution
Given ,
- Mr. Johnson uses 2.34 yards of yarn to knit a scarf
- Mr. Johnson has a total of 30.42 yards of yarn
To Find : Scarfs Mr John will be able to make if he has 30.42 yards of yarn
2.34 yards of yarn = 1 scarf
30.42 yards of yarn =

= 13 scarfs
Hence , the number of scarfs Mr John will make with 30.42 yards of yarn is 13