Answer:
Ratio = 1 : 4
Step-by-step explanation:
Total marbles = 10
Given 1/5 is red, that is 1/5 of the total marbles are red

Therefore , 10 - 2 = 8 marbles are blue.
Ratio of red marbles to blue marbles

and
both have a common denominator, so you can combine them into a single fraction:

You cannot simplify this fraction further:
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Answer:

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49,997/50,000
Is the probability of not being struck by a unicycle
The square root of 100 is 10