Question

You and your friend are shopping for painting supplies. Your friend wants five bottles of paint
and one set of paint brushes. You want seven bottles of paint and two sets of paint brushes. Each
bottle of paint costs $3.69. If you and your friend’s total cost is $51.69, what is the cost of one set
of paint brushes?

Answer 1

cost of each bottle of paint =$3.69
thus, cost of (7+5=) 12 bottles of paint= 3.69 * 12
let the cost of each set of brush= x
therfore cost of total 3 sets of brush = 3x
but total money spent =51.69 = (3.69* 12) -3x

Answer 2

thus calculate x whichis the cost of one set of brushes