Malika buys 3 packs of strings and 2 music books. Alexander buys 2 packs of strings and one music book. The music book
costs $18. Their total cost is $130.25. How much is a pack of guitar strings?

$15.25

Step-by-step explanation:

If you take the cost of one music book and multiply that by the number of books in total, that equals $54. You then take the total cost and subtract $130.25-$54= 76.25. Once you have that number you can divide that number by the total amount of packs of string and you get $15.25.