Why is 6 afraid of 7?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Can you move 2 matchsticks to form four equal sized squares.

Before Mount Everest was discovered, what was the highest mountain in the world?

Can you count the number of quadrilaterals in the picture below?

You are given 2 eggs.
You have access to a 100-storey building.
Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor, Both eggs are identical.
You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

what's the probability of getting a king or a queen from a pack of 52 cards?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?