Bird
0
0

You want to calculate the average of three numbers a, b, and c in Ruby. Which expression correctly uses arithmetic operators to do this?

hard📝 Application Q8 of 15
Ruby - Operators and Expressions
You want to calculate the average of three numbers a, b, and c in Ruby. Which expression correctly uses arithmetic operators to do this?
A(a * b * c) / 3
Ba + b + c / 3
C(a + b + c) / 3
Da + b + c % 3
Step-by-Step Solution
Solution:

  1. Step 1: Understand average formula

    Average is sum of numbers divided by count.

  2. Step 2: Check operator precedence and grouping

    Parentheses ensure sum is calculated before division.

  3. Step 3: Evaluate options

    Only (a + b + c) / 3 correctly sums all then divides by 3.

  4. Final Answer:

    (a + b + c) / 3 -> Option C

  5. Quick Check:

    Average = sum / count [OK]
Quick Trick: Use parentheses to sum before dividing [OK]
Common Mistakes:
MISTAKES
  • Missing parentheses causing wrong order
  • Using multiplication instead of addition
  • Using % instead of division

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Ruby Quizzes
Arrays - Array modification (push, pop, shift, unshift) - Quiz 4medium Arrays - Array sorting and reversing - Quiz 5medium Methods - Variable-length arguments (*args) - Quiz 5medium Ruby Basics and Runtime - How Ruby interprets code at runtime - Quiz 10hard Ruby Basics and Runtime - Why Ruby emphasizes developer happiness - Quiz 13medium String Operations - String slicing and indexing - Quiz 15hard String Operations - Why strings are mutable in Ruby - Quiz 8hard String Operations - Gsub and sub for replacement - Quiz 5medium Variables and Data Types - Symbol type and immutability - Quiz 7medium Variables and Data Types - Dynamic typing vs strong typing - Quiz 13medium