Answer:
7 cause mode is the most occurring number
Each petal of the region

is the intersection of two circles, both of diameter 10. Each petal in turn is twice the area of a circular segment bounded by a chord of length

, which implies the segment is subtended by an angle of

. This means the area of the segment is


This means the area of one petal is

, and the area of

is four times this, or

.
Meanwhile, the area of

is simply the area of the square minus the area of

, or

.
So



(provided these regions are indeed disjoint; it's hard to tell from the picture)
Answer:
Ratio: 20:36
Rate: 20 squids per 36 eels
Simplified ratio:

Unit ratio:
20/36 squids per eel (dividing by 36)
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