The Trickiest Math Questions on the Bocconi Test (Step-by-Step Solutions)

The Bocconi Test has a reputation for being tough — for one simple reason: the math questions don't just test what you know. They test whether you can avoid the traps under pressure.

Every year, thousands of candidates lose points on questions they could have solved — if they'd spotted the trap in time.

In this article, we break down the 5 most common math traps on the Bocconi Test, with simple methods you can apply on test day.

PrepAdmit tip: Train every day with the Random mode — 20 questions in 10–15 minutes. One subway ride, one full session, and you can track your progress in the dashboard.

Why are Bocconi math questions so tricky?

Because you have to be both fast and sharp:

• 75 minutes for 50 questions → 90 seconds per question
• Decoy answers designed to catch your eye
• Ambiguous wording and misleading phrasing
• Calculations that look long but have a shortcut

👉 Pressure plus speed turns small traps into big point losses.

The 5 unmissable math traps

1. The missing unit trap

Sample question: A car drives at 90 km/h for 40 minutes. How far does it go?

Common mistake: multiplying 90 × 40 = 3600 (WRONG)

Correct method:

40 minutes = 40/60 = 2/3 hour
Distance = 90 × (2/3) = 60 km

PrepAdmit hack: always highlight the units. The moment they don't match, convert before calculating.

2. The percentage-of-a-percentage trap

Sample: €100 → +20% → −20% = ?

Common mistake: assuming the changes cancel out → €100 (WRONG)

Correct method:

Increase: 100 × 1.20 = €120
Decrease: 120 × 0.80 = €96

Golden rule: a percentage always applies to the new amount. Two equal percentage changes → net negative impact.

3. The weighted average trap

Sample:

Math: 15/20, weight 3
English: 12/20, weight 2
Average = ?

Common mistake: (15 + 12) / 2 = 13.5 (WRONG)

Correct method:

(15×3 + 12×2) / (3+2) = 69 / 5 = 13.8

Visual cue: if you see weight or coefficient, it's weighted → never divide by the number of grades.

4. The conditional probability trap

Sample: 60% of students are girls. 40% of girls wear glasses. What percentage of all students are girls who wear glasses?

Common mistake: answering 40% (WRONG)

Correct method:

0.60 × 0.40 = 0.24 = 24%

Tip: always draw a tree diagram or table — it visualizes the information instantly.

5. The misleading ratio trap

Sample:

Girls-to-boys ratio = 3:2
Total students: 30
Number of girls = ?

Common mistake: dividing or multiplying directly by 3 or 2 (WRONG)

Correct method:

3 + 2 = 5 parts
1 part = 30 / 5 = 6 students
Girls = 3 × 6 = 18

Practice ratios daily and this question type becomes automatic.

How to avoid these traps on test day

The 90-second method:

1️⃣ Read the question twice (20 sec)
Watch for: units, successive percentages, weights, key words like total, among, of the…

2️⃣ Identify the trap (10 sec)
Successive percentages? Conditional probability? Mismatched units?

3️⃣ Solve + sanity check (60 sec)
Does the result make sense? Is the order of magnitude plausible?

An answer that looks too obvious on the Bocconi Test… almost never is.

How to train effectively

The PrepAdmit program (15 minutes a day):

• Random mode — 20 questions on mobile
• Automatic dashboard tracking your time per question
• Instant error analysis
• Replay tricky questions until you master them

Results we see in our users: +35% speed • −50% errors • +5 to +8 points on the final score (out of 50).

PrepAdmit's training mode replicates the real pressure and the exact same traps you'll face on test day.

Your action plan: the anti-trap checklist

This week:

• 3 sessions of 20 questions → first diagnostic
• Identify your 3 most frequent mistakes
• Target: under 100 seconds per question

Next week:

• At least 5 sessions
• Apply the 3-step method consistently
• Target: around 90 seconds per question

Test day:

• Breathe before starting
• Highlight units and keywords
• Be cautious when an answer feels too easy
• Review 4–5 doubtful questions at the end

The difference between 35/50 and 45/50

Top scorers aren't necessarily better at math. They're better at avoiding traps.

These mistakes are predictable. They're trainable.

With PrepAdmit, you can:

• Simulate the real test (50 questions — 75 min)
• Train on the go (20 questions — 10/15 min)
• Track your progress automatically
• Build trap-detection reflexes

Ready to turn your weaknesses into strengths? Start your free training on PrepAdmit today.