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

How many times can you subtract the number 5 from 25?

How can you take 2 from 5 and leave 4?

Can you spot the hidden clock in this family photo? Only the most eagle-eyed will find it!

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Can you write down eight eights so that they add up to one thousand?

John had a bag containing colourful marbles. The colours are red, green and blue. The total number of marbles he had in his bag was 60. There are 4 times as many red marbles as green marbles. 6 more blue marbles than green marbles. How many marbles of each colour did John have?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Which point will the car reach to go out?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?