SSC CGL 2025 Tier-I · 22 September 2025, Shift 1 · Quantitative Aptitude · Question 5 of 98

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.

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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.

A bucket can hold 6.25 liters of water. How many such buckets are needed to fill a 1 cubic meter tank?

(a)150
(b)160
(c)165
(d)170

Answer

Why

Correct — B. Put both volumes in the same unit first.

Convert the tank: 1 m³ = 1000 litres
Divide by one bucket: 1000 ÷ 6.25
Write 6.25 as 25⁄4: 1000 × 4⁄25 = 160 → option (b)

Check: 160 × 6.25 = 1000 litres exactly.

Why the others are wrong

(a)
150 — 150 buckets hold 150 × 6.25 = 937.5 litres, which leaves the tank 62.5 litres short of 1000.
(c)
165 — 165 buckets hold 165 × 6.25 = 1031.25 litres, 31.25 litres more than the tank takes.
(d)
170 — 170 buckets hold 170 × 6.25 = 1062.5 litres, overflowing the 1000-litre tank by 62.5 litres.

Concept

The litre is one cubic decimetre. A metre is 10 decimetres, so a cubic metre is 10 × 10 × 10 = 1000 litres.

Once the tank is in litres, the count is a plain division: total volume ÷ volume of one bucket.

Reading 6.25 as 25⁄4 turns the division into multiplying by 4 and dividing by 25, which is quicker than long division by a decimal.

The division comes out exact, so no rounding is needed. Had it not, the count would round up, because a part-bucket still has to be poured.

Key facts

1 litre = 1 dm³ = 1000 cm³.
1 m³ = 1000 litres = 1 kilolitre.
Dividing by 6.25 is the same as multiplying by 0.16, since 6.25 = 25⁄4.

Study next

Capacity of a cylinder or cuboid in litres from dimensions in cm or mRise or fall of the water level when litres are added to or drawn from a tankConversions between cm³, litres, m³ and kilolitres

Common traps

Converting a cubic metre as if it were a metre: 1 m³ is 1000 litres, not 100, and 100 ÷ 6.25 = 16 fits no option.
Picking a nearby option without multiplying back: 165 looks close until 165 × 6.25 = 1031.25 is checked.

Here the unit conversion is the whole question. The same 1 m³ = 1 kilolitre link decides 19 Sep 2025, 16:00, Quant Q.11, and 1 litre = 1000 cm³ decides 25 Sep 2024, 12:30, Quant Q.17 and 17 Sep 2024, 09:00, Quant Q.7.

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