In a secret underground laboratory, every scientist is either a geneticist or a physicist, but never both. There are twice as many geneticists as physicists. If there are 33 scientists in total working in the laboratory, how many physicists are there?
11
Let P be the number of physicists. Geneticists = 2P. Total = P + 2P = 3P = 33. Therefore, P = 11 physicists (and 22 geneticists).
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Easy. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
More logic riddles
You have three closed boxes labeled 'Apples', 'Oranges', and 'Mix'. Every label is guaranteed to be wrong. You are allowed to pull out only one fruit from only one box without looking inside. Which box should you pick a fruit from to correctly identify the contents of all three boxes?
Three people stand in a line facing forward: Person 3 sees Persons 2 and 1; Person 2 sees Person 1; Person 1 sees no one. They are shown 3 red hats and 2 blue hats. Everyone is fitted with a hat. Person 3 says, 'I do not know my hat color.' Hearing this, Person 2 says, 'I do not know my hat color either.' What color hat is Person 1 wearing?
Four siblings share a basket of strawberries. Alice receives more strawberries than Bob. Charlie receives fewer strawberries than Bob. Diana receives more strawberries than Alice. Who received the second highest number of strawberries?
A painter works in a circular room with no corners. She needs to paint an identical blue stripe across the exact center of every wall. She starts at the north wall and walks in a straight line across the room to the south wall, painting as she goes. Without lifting her brush, how many distinct walls must she paint during this single straight-line crossing?
You have 9 coins that look identical, but one is counterfeit and weighs slightly less than the rest. Using a balance scale, what is the minimum number of weighings needed to guarantee finding the fake coin?
The snowball is smaller than the icicle, and the icicle is smaller than the mitten. Which one is the biggest?