Answer :
cost of both = 40 - 4 = $36
bracelets cost = 3 * $5 = $15
all (3) necklaces cost = $36 - $15 = $21
1 necklaces cost = $21/3 = $7
bracelets cost = 3 * $5 = $15
all (3) necklaces cost = $36 - $15 = $21
1 necklaces cost = $21/3 = $7