Jacob strode up 24 steps in 12 seconds to reach his apartment on the second floor. How many steps did he climb in 9.5 seconds?

He climbed 19 steps

Step-by-step explanation:

Let steps climbed in 9.5 seconds = z

If 24 steps = 12 seconds

then: z = 9.5 seconds

Using criss cross method

24 x 9.5 = 12 x z

228 = 12 z

z = 228/12

z = 19 steps