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Vandaag is het 7 June 2023

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# Sawing and weighing - math puzzle

Difficulty:

Rating: 2.9/5.0

How should you saw a block of stone of 40 kg into four pieces such that you can measure all weights of an integer from 1 kg to 40 kg (so 1 kg, 2 kg, 3 kg, 4 kg, ..... 39 kg and 40 kg) on a balance?

# Infected? - math puzzle

Difficulty:

Rating: 2.4/5.0

 Suppose that 1 out of 1000 people of a specific country are infected with the deadly X-virus. An inhabitant of that country goes the hospital and gives some blood for a survey. Her blood is checked on the X-virus by a test which gives a correct outcome in 99% of the cases. The test points out that the woman is infected. After the investigation, a doctor tells the woman that he is 99% sure that she is infected with the X-virus. Can the doctor be right by making this worrying statement?

# Painting stairs - math puzzle

Difficulty:

Rating: 2.4/5.0