The correct answer is fifteen be the equation for Kane is given and is 7x+50 where we can only assume that 7 is how much he pays for each video game that he wants and x is the number of video games he buys. The addition of fifty on the end is what I can only assume to be his membership fee and because we know that Justin is paying more for his membership fee, to find the answer you must take Justin's membership fee of 65 and subtract Kane's membership fee of 50. 65-50=15.