Kin needs to have at least 500 panels of canvas for his art school. He orders 30 boxes of canvas. Each package contains 15 canvas. Does he have enough? If not how many more boxes should he order?
Kin orders 30 boxes of canvas, and each box contains 15 canvases. So, he has a total of 30 * 15 = <<30*15=450>>450 canvases.
Since he needs at least 500 canvases, Kin needs to order an additional 500 - 450 = <<500-450=50>>50 canvases.
Therefore, he should order an additional 50 / 15 = <<50/15=3.33>>3.33 boxes of canvas.
Since he cannot order a fraction of a box, Kin should order 4 additional boxes of canvas. Answer: \boxed{4}.