Music Building A has 72 steps from the first floor to the fifth floor, and each step is about 0.23 meters high. Xiaohong lives on the ninth floor, from the first floor to.

Because there are 72 steps from the first floor to the fifth floor, there are 72 ÷ 4 = 18 steps every two floors (there are 4 stairs from the first floor to the fifth floor).

Therefore, there are 8 stairs from the first floor to the ninth floor, with a total of 18× 8 = 144 steps, and the height of each step is 0.23m, so the height from the first floor to the ninth floor is 0.23x144 = 33.12m.

List as comprehensive type:

72÷(5- 1)×(9- 1)×0.23

=72÷4×8×0.23

= 18×8×0.23

= 144×0.23

= 33. 12 (m)

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