Answer:
The average weight of new born otter was, 
Step-by-step explanation:
Let average weight of new born otter be x.
As per the given statement: At birth it's weight was 7/8 kilograms which is 9/10 kilogram less than the average weight of a new born otter in the aquarium
"
kg less than average weight of a new born otter" means 
As per the given information, we have;

Add
both sides, we have;

Take LCM of 8 and 10 is, 40
⇒
Simplify:

Therefore, the average weight of new born otter was, 
ΔACB and ΔMNB are similar. Therefore the corresponding sides are in proportion:

Substitute:

Answer:
4:1
Step-by-step explanation:
22/5.50
divide numerator by denominator and denominator by denominator
22/5.50=4
5.50/5.50=1
4/1 or 4:1