To get the write expression, it is best to understand and dissect each statement written.
sells boxes of bracelets (b) for $30
boxes of necklaces (n) for $50
batches of bracelets that fill 5 boxes
batches of necklaces that fill 7 boxes
Total number of boxes = 48
Total cost = 320
The equations that will solve the problem are:
5b = 48 - 7n 30
b + 50n = 320