Quantitative Aptitude practice
Arithmetic under time pressure. The maths is school-level; the difficulty is the clock.
15 questions, 15 minutes, one mark each with nothing deducted for a wrong answer. Every explanation shows the working, so a question you get wrong is worth more than one you get right.
Quantitative Aptitude practice
Questions written for this site to practise on. They are not from any real examination and no exam body is connected to them — every answer can be checked by hand from the explanation.
- Questions
- 15
- Minutes
- 15
- Max marks
- 15
- Sections
- 1
About quantitative aptitude
Quantitative aptitude sections are built from a small number of ideas asked in many disguises: percentages, ratios, averages, interest, profit and loss, time and work, and speed. Almost every question is one of those wearing a different story.
Because the underlying maths is straightforward, the sections are won on method rather than knowledge. Somebody who computes 12% of 250 by finding 10% and adding 2% will finish a paper that somebody reaching for long multiplication will not.
That is why the explanations here show the working and, where there is one, the shortcut. A question you got right slowly is still a question worth reading the explanation for.
Where marks get lost
- Taking a percentage of the wrong number.
- A percentage change is always measured against what you started with. Going from 40 to 50 is a 25% rise, not 20% — dividing by 50 is the single most common error in this topic.
- Adding rates instead of adding work.
- If A takes 12 days and B takes 18, they do not take 15 together. Add what each does in one day — 1/12 + 1/18 — and invert. Rates add; times do not.
- Mixing units mid-question.
- Convert once, at the start. A speed in km/h against a length in metres needs the ×5/18 first, or every step after it is wrong by a factor you will not spot.
- Confusing simple and compound interest.
- Simple interest earns nothing on the interest already paid. Compound does, which is why two years at 10% on ₹5,000 gives ₹1,050 rather than ₹1,000 — the extra ₹50 is interest on the first year’s interest.