Answer: There are 4 tubes of paint she purchased.
Step-by-step explanation:
Since we have given that
Amount spend on tubes of paint and brushes for an art project = $16
Cost of each tube of paint = $3
Cost of each brush = $0.50
Let the price of tube of paint be 'x'.
Let the price of brush be '2x'.
So, According to question, it becomes,
[tex]3x+0.50\times 2x=16\\\\3x+x=16\\\\4x=16x\\\\x=\dfrac{16}{4}\\\\x=4[/tex]
Hence, there are 4 tubes of paint she purchased.