SSC CGL 2025 Tier-I · 16 September 2025, Shift 1 · Quantitative Aptitude · Question 8 of 100

We transcribed this text from the pictures on a candidate's response sheet for this shift; the answer is the key SSC colour-marked on that sheet. Solution last reviewed 13 September 2026.

Where this paper and its answers come from

SSC does not publish CGL question papers or a public answer key. From 2025 the candidate response sheet prints every question and option as a picture, so the text here is transcribed from those pictures for this shift and checked against them independently; where the layout carries meaning, the picture is shown as well. Each answer is the key SSC colour-marked on that sheet. SSC released a tentative key for challenge and later its final one, both only to candidates behind a login, and the sheet does not say which of the two it carries. The solutions are written by UnlockIAS.

Table – Weekly Fuel Usage (litres) Vehicle | Mon | Tue | Wed | Thu | Fri Truck1 | 18 | 20 | 22 | 21 | 19 Truck 2 | 25 | 24 | 26 | 23 | 24 Q: What is the overall average daily fuel usage for both trucks?

(a)27 litres
(b)22.2 litres
(c)28 litres
(d)21.5 litres

Answer

Why

Correct — B. Add all ten readings and divide by ten.

Truck1 total = 18 + 20 + 22 + 21 + 19 = 100
Truck 2 total = 25 + 24 + 26 + 23 + 24 = 122
Both trucks = 100 + 122 = 222 litres over 10 readings
Average = 222 ÷ 10 = 22.2 litres → option (b)

Why the others are wrong

(a)
27 litres — 27 litres is above the largest reading in the table, 26 (Truck 2 on Wednesday). An average can never exceed the largest value averaged.
(c)
28 litres — 28 litres is above every entry in the table, the largest being 26, so it cannot be an average of those entries.
(d)
21.5 litres — 21.5 litres would need the ten readings to total 215, but they total 100 + 122 = 222.

Concept

Average = total ÷ number of values. Two rows of five days give 10 readings, so the divisor is 10.

Because each truck has the same number of readings, the overall average also equals the mean of the two truck averages: Truck1 averages 100 ÷ 5 = 20, Truck 2 averages 122 ÷ 5 = 24.4, and (20 + 24.4) ÷ 2 = 22.2.

The stem could also be read as the fuel both trucks use together per day: 222 ÷ 5 = 44.4 litres. That figure is not among the options, so the options settle the reading as the average per truck per day.

Key facts

Average = sum of values ÷ number of values.
An average always lies between the smallest and largest values averaged.
Averaging the two truck averages works here because both trucks have the same number of readings (5).

Study next

Weighted average when groups have different sizesPercentage change between rows or days in a tableCombined total versus per-item average in table questions

Common traps

Dividing 222 by 5 days instead of 10 readings, then finding 44.4 missing from the options.
Averaging one truck only: Truck1 gives 20 and Truck 2 gives 24.4, and neither is the overall figure.

A small table with an average asked. Similar table averages appear at 15 Sep 2025, 09:00, Quant Q.8 (salesperson Q's average monthly sales) and 14 Sep 2025, 09:00, Quant Q.6 (the product with the highest average units sold).

Related PYQs

No directly related past PYQ was found.

Topic: Averages — all 76 SSC CGL questions on it, every solved shift.