A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

What 5-letter word typed in all capital letters can be read the same upside down?

Can you find the missing piece of the Porsche?

Which part of London exists in France as well ?

Some friends went on a vacation to a resort. It was raining heavily and it kept raining for thirteen days.

When it rained in the morning, the afternoon was beautiful and when it rained in the afternoon, the day was blessed with a clear morning.

Overall, the friends experienced eleven nice mornings and twelve nice afternoons. Can you find out the number of days they spent on vacation?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?