Answer: Cost of each set of knitting needles is $3.2.
Step-by-step explanation:
Since we have given that
Number of balls of yarn Jillian wants=3
Number of set of knitting needles Jillian wants = 1
Number of balls of yarn Tyson wants = 1
Number of sets of knitting needles Tyson wants = 2
Cost of 1 ball of yarn = $6.25
So, total amount incurred on balls of yarn is given by

Now, let the cost of each set of knitting needles be x
According to question,
Hence, cost of each set of knitting needles is $3.2.