Question 1 from 10: How many times does the clock hands (the one that shows the hour and the one that shows the minutes) form a 90 degrees angle within 12 hours?
Question 2 from 10: A lady, trying to hide her real age, answeres to the next question: "How old are you?". "I am 22, if I don't count the weekends and one month in every summer ". What's the lady's age?
Question 3 from 10: Anna, Bill, Cindy and Daniel have to finish a project. Anna, Bill si Cindy can finish the project in 10 days; Bill, Cindy si Daniel can finish the project in 11 days; Cindy, Daniel, si Anna can finish the project in 12 days; Daniel, Anna si Bill 13 days. Wich one of them has the best performances?
Question 4 from 10: The number of the remain hours from one day is half of the number of past hours. What time is it?
Question 5 from 10: There are 4 boys with different ages. The younger one's age is bigger than 1 year. How old is the oldest boy knowing that if we multiply theirs ages we get 792 years?
Question 6 from 10: Three appels have been weighted in pairs and they have the next weights: 200 g, 204 g and 208. What is the weightless apple?
Question 7 from 10: Three qualified workers and four unqualified workers can build a wall in 5 days, but two qualified workers and four unqualified workers can build a wall in 6 days. What category of workers is the more productive one?
Question 8 from 10: A watermelon weighs 5 kg and it has 95% water. What is the weight of the same watermelon if it has 75% water.
Question 9 from 10: A group of 9 persons has to write a project. Each one of them has to write a chapter and send it with a mail. What is the lowest number of mails that need to be sent so every person in the group can have the final form of the project.
Question 10 from 10: To set two pictures on a wall requires at least 6 drawing pins because the corners can overlap . What is the minimum number of drawing pins to catch 11 pictures?