Candice is a high school senior applying to a particular art school. All students who want to attend this art school must send in a portfolio that meets very specific requirements. The portfolio must have one black-and-white drawing, one color drawing, one oil painting, and one computer designed image. Candice has 3 favorite black and white drawings, 10 favorite color drawings, 5 favorite oil painting, and ____ favorite computer designed images. That leaves her with 750 possible different portfolios to choose from. How many favorite computer designed images does Candice have?