Hello there friend! For part A, an equation that could be used to find the number of bracelets is 12 x 3 + 6n = 60.
Then, for part B, we can subtract the total amount that the bracelets costed, so we would do 3 times 6 which is 18 and then 40 minus 18 equals 22. After that, we can divide 22 by 4 which is 5 and 2 leftover. This tells us that each scarf costs 5 dollars.
Hope this helps! Have a great day!