Please answer the following question by reasoning step-by-step.
John climbs up 9 flights of stairs. Each flight is 10 feet. If each step is 18 inches, how many steps does he climb up?

60
He has to climb 9 * 10 = 90 feet.

That means he needs to climb 90 * 12 = 1080 inches.

That means he needs to climb 1080 / 18 = 60 stairs.

.

Final answer: 60