This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
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Step 1: Identify the total number of balls and the probability of selecting a blue ball. Total number of balls = 30 Probability of selecting a blue ball,
Step 2: Use the probability formula to find the number of blue balls. The probability of an event is given by: For selecting a blue ball: Substitute the given values:
Step 3: Solve for the number of blue balls. Multiply both sides by 30:
Step 4: Calculate the number of red balls. The bag contains only red and blue balls. Subtract 18 from both sides:
The number of red balls in the bag is .
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Identify the total number of balls and the probability of selecting a blue ball. Total number of balls = 30 Probability of selecting a blue ball, P(blue) = (3)/(5) Step 2: Use the probability formula to find the number of blue balls.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.