If you can answer these three questions, you are smart

Needless to say, Yale has not only the smartest students, but the smartest professors too Cognitive reflexology test He developed what is probably the fastest intelligence test in the world. Testers only have to answer three questions so they then know if they are smart.

Question 1: The cost of the ball is 5 cents.

A racket costs 1 euro more than a ball, so the amount of cents for the ball and racket should be the same. 10 cents divided by two equals 5 cents. So the racket is $1.05 and the ball is 5 cents.

Second question: 100 machines need 5 minutes for 100 machines

One thing is clear: each machine produces a product in 5 minutes. So 100 machines can finish 100 products in 5 minutes.

Question 3: Water lilies need 47 days to cover half the area of ​​the lake.

The amount of water lilies doubles every day. On day 48 the whole lake is covered, which means: half of the lake should be covered one day before this 48th day. Because on day 48 the amount is doubled – which is why the correct answer is 47 days.