Allison Lee asked 11/13/2016 bob chooses 15 downloads for $19.75, Jim chooses 40 downloads for $43.50. What is the registration fee, and what is the cost of each download?

Allison Lee asked 11/13/2016 at maximum speed an airplane can travel 2460 miles against the wind in 6 hours. The plane can go the same distance, but with the wind in 5 hours. What is the speed of the plane with no wind?

Allison Lee asked 11/13/2016 Five times the sum of the digits of a two-digit number is 13 less than the original number. If you reverse the digits in the two-digit number, four times the sum of its two digits is 21 less than the reversed two-digit number?