15*(x) + F = 19.75 or 15x + F = 19.75

40(x) + F = 43.50

Where the "cost of each download"is x and where the registration fee is F and both are the same for both Bob and Jim.

Treat those two equations as a system of equations and solve for both x and F and you will get your answer.

Comment if you need more help.

(Just to give you a ball park figure, the cost per download is not over a dollar.)

2 People thanked the writer.
Virginia Lou commented
I looked at this, couldn't quite wrap around it I think it was late...
good for you...
Tom Jackson commented
I actually did this three times before I got the right answer. The equations were immediate, but I was trying to do too much in my head and screwed up in actually substituting and solving them.

1 Person thanked the writer.
Tom Jackson commented
Never saw a math book with "hundreds" of answer to such problems.

The most I have ever seen is 42.
Jann Nikka commented
Whatever Tom 😝. I'll take the high ground and let you argue with yourself. Continue to post 😲.
Tom Jackson commented
High ground is relative.

I'm usually looking up, but I can look down when you want me to watch you chugging along.