Geometry

Question Analysis
This question combines the concept of probability with basic arithmetic operations.
Given the probability of an event (picking a red ball) and the total number of objects, it asks for the number of non - favorable objects (blue balls).
The main focus is on using the probability to find the number of red balls first and then calculating the number of blue balls.

Key Concept Explanation
The probability of an event can be used to find the number of times that event occurs within a set of objects.
Here,
Once the number of one type of object is known, the number of the other type can be found by subtracting from the total.

Step-by-Step Solution
First, find the number of red balls.
Using the formula , with

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