Answer:
-5/2
Step-by-step explanation:
Answer:
There is no "next number"
I think.
Step-by-step explanation:
Answer:
21:50
Step-by-step explanation:
We need to find the ratio of 420 m to 1 km.
We know that,
1 km = 1000 m
So,
The ratio becomes,

So, the required ratio is 21:50.