Children's tickets to a show are 5 dollars each and adult tickets are 7 dollars each. What would the total price be for children's tickets and 4 adult tickets?

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.