One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?
Weigh a group of 3 balls against another group of 3, then you'll know which group of 3 contains the heavy ball. Pick 2 balls from that group and weigh one against the other.
If you had five mangoes and two bananas in one hand and two mangoes and four bananas in the other hand, what would you have?
Very large hands.
Placed above it makes greater things small. Placed beside it makes small things greater. In matters that counts it always comes first. Where others increase it keeps all things the same. What is it?
If it takes four rat catchers four minutes to kill four rats, how many rat catchers would be needed to catch 50 rats in 50 minutes?
The same number of rat catchers, four
In olden days, the student of logic was given this problem: If half of 5 were 3, what would one-third of 10 be?
It would be 4
I have 10 red socks and 10 blue socks in a drawer. How many socks must I take out to ensure that I have at least one matching pair? One how many to ensure I have at least a pair of red and a pair of blue?
Three for one pair, and twelve to ensure one pair of each color.
What happened to the plant in the math classroom?
It grew square roots, of course.
Your shirt has two holes in it. How many holes are there?
There are six holes because it has already has four holes in it.
One fourth of the population of a newly discovered planet have 4 legs. The rest have two legs. There are 60 legs total. How big is the population of the newly discovered planet?
If you go to the movies and you are paying, is it cheaper to take one friend to the movies twice or two friends to the movies at the same time?
It’s cheaper to take two friends to the movies at the same time. If you go two times your buying four tickets total but if you go at the same time your only buying 3.