Deepest part of a swimming pool is 12 feet deep. the shallowest part is 3 feet deep. what is the ratio of the depth of the deepest part of the pool to the depth of the shallowest part of the pool

Deepest part of the swimming pool = 12 feet deep
Shallowest part of the swimming pool = 3 feet deep
Thus the ratio of both swimming pool depth is:
=> 12 : 3
12 – 3 = 9
The deepest part of swimming pool is 9 feet deeper compare to the shallowest part of the swimming pool.
Ratio is simply mean the number of x is to the number of y
=> x : y

Move the decimal behind it