Answer:
12 : 6 = N : 4
Explanation:
Jacob stride 12 steps in 6 seconds to reach his apartment on the second floor. The number of step he will climb in 4 seconds can be solved below using the following proportion.
It took him 6 seconds to establish 12 steps .
it will take him 4 seconds to establish N number of steps
cross multiply
12 × 4 = 6N
48 = 6N
divide both sides by 6
N = 48/6
N = 8 steps
Now the correct equation base on the option is as follows:
12 steps is to 6 second which is 12 : 6 will establish an equal proportion with N steps to 4 seconds which is N:4. Therefore,
12 : 6 = N : 4
12/6 = N/4
cross multiply
48 = 6N
N = 48/6 = 8 steps