Hard Mathematical Brain Teasers for Sharp Thinkers
Dive into a set of tough arithmetic puzzles designed to stretch your problem‑solving abilities and reward logical insight.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
What positive integer becomes 30 greater when increased by its double?
- 2
If you multiply a number by 4 and then subtract 7, you obtain the same result as adding 5 to twice the original number. What is the number?
- 3
A farmer counts 30 heads and 80 legs among his cows and chickens. How many cows are present?
- 4
The sequence 2, 6, 12, 20, … follows which formula for its nth term?
- 5
Find the smallest positive integer that leaves remainder 1 when divided by 2, remainder 2 when divided by 3, and remainder 3 when divided by 4.
- 6
A rectangular garden is twice as long as it is wide and its perimeter is 60 meters. What is the area?
- 7
The sum of three consecutive odd integers is 99. What is the largest of these integers?
- 8
In a code, 7→100, 8→101, 9→110, 10→111. How is 11 coded?
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