[Question]: A marathon is 26 miles. He can run the first 10 miles in 1 hour. For the remaining miles he runs at 80% that pace. How long does the race take?
[Answer]: There are 26 - 10 = 16 miles left for the rest of the race. He runs 10 * .8 = 8 miles per hour. So it takes him 16 / 8 = 2 hours. So in total it takes 1 + 2 = 3 hours.
So the answer is 3.

[Question]: Jon’s textbooks weigh three times as much as Brandon’s textbooks. Jon has four textbooks that weigh two, eight, five and nine pounds respectively. How much do Brandon’s textbooks weigh?
[Answer]: Jon’s textbooks weigh 2 + 8 + 5 + 9 = 24 pounds. Thus, Brandon’s textbooks weigh 24 / 3 = 8 pounds.
So the answer is 8.

[Question]: An 18-month magazine subscription is normally $34. The magazine is currently running a promotion for $0.25 off each twice-a-month issue when signing up for the 18-month subscription. How many dollars cheaper is the promotional subscription than the normal one?
[Answer]:
The subscription sends twice monthly issues, so there are 2 * 18 = 36 issues. Thus, the promotional offer is 36 * 0.25 = $9 cheaper than the normal subscription.
So the answer is 9.