# Infected? - math puzzle

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? |

# Sequences - math puzzle

What are the next numbers in the following sequences?

a: 77, 143, 221, 323, 437

b: 1, 5, 32, 288, 3413

c: 827, 23, 11, 6, 3

d: 2, 3, 5, 11, 31

e: 100, 121, 144, 202, 244

a: 77, 143, 221, 323, 437

b: 1, 5, 32, 288, 3413

c: 827, 23, 11, 6, 3

d: 2, 3, 5, 11, 31

e: 100, 121, 144, 202, 244

# Bob and John - math puzzle

Bob and John form a team together. Bob is as old as John will be when Bob is twice as old as John was when Bob was half as old as the sum of their current ages. John is as old as Bob was when John was half as old as he will become over ten years.

How old are Bob and John?

How old are Bob and John?