Average for SSC CHSL | Concepts & Practice | SSC CHSL Quantitative Aptitude

Learn the shortcut

Understand the fastest pattern for this topic before you attempt full MCQs.

Avoid common traps

See where students commonly lose marks so you can eliminate bad options earlier.

Solve faster in exam

Apply one practical method before attempting MCQs and cut down hesitation.

Summary Formula Tricks Mistakes Solved Example Practice FAQ

Average revision for SSC CHSL: understand the base rule, apply the correct formula or relation, check common traps, then practise with approved questions.

Average represents equal distribution: total of observations divided by their number. Most SSC questions become faster when you work with total = average × number instead of repeatedly adding values.

SSC CHSL focus: Solve the core method first, then use the approved practice questions on this page to build exam-speed accuracy.

Average revision rule: concept → formula/relation → one worked example → timed practice → error review.

Core concept
Key formula/relation
Common trap
Approved practice

Average = Sum / Number
Sum = Average × Number
Combined average = (sum of all groups)/(total items)

When one value is replaced, use the change in total instead of recalculating the whole average.

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You can start learning here right away, explore formulas and tricks, and use the current limited practice flow before premium tools arrive.

Read the exact requirement before choosing a shortcut.
Keep units, signs and percentage bases consistent.
Use the final few seconds to verify direction and magnitude.

Using a memorised shortcut without checking its condition.
Skipping unit or base conversion.
Doing long arithmetic before identifying the underlying relation.

Practice example: The average of 7 numbers is 18. If the number 14 is replaced by 28, what will be the new average?

Solution: The new average is 20.

Find the average of 18, 22, 26, 30 and 34.
What is the average of the first five positive even numbers?
In a Average practice set, a student answers 18 questions correctly out of 24. What percentage is correct?

Learn the shortcut first

Shortcut before you solve

Average questions are usually total questions in disguise.

Faster solving steps

Use this 4-step method before solving to keep your thinking fast and repeatable.

Step 1 Identify relation

Spot the pattern, relationship, or core idea first.

Step 2 Apply same pattern

Use the same rule instead of re-solving from scratch.

Step 3 Eliminate wrong options

Remove confusing choices before comparing the last few.

Step 4 Confirm final answer

Pick the option that matches the shortcut most cleanly.

Practice Questions

Start with the first 10 questions free, then unlock the rest with premium

Now apply the trick on real questions

Use the shortcut above before solving these questions

Use Average = Total / Number and reverse it as Total = Average x Number when needed.

Tip: When one value changes, total changes first and average changes after that.

Step 1

Total = Average x Number.

Step 2

12 x 5 = 60.

Rule

Average is not a standalone value; it always represents total divided by count.

3-second trick

Convert the average into total immediately if the question asks for addition or replacement.

Trap to avoid

Changing the average directly without updating the total first.

Correct answer

60

Thinking path

There are 5 numbers.
Average is 12.
So total is 60.

Final answer: 60

Why this is fast: Once total is found, most average variations become easy.

Free now: first 10 questions Premium later: full solutions, advanced tricks, targeted practice

Q1 Easy

What is the average of the first five positive even numbers?