2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

Using Only Five 5's and any mathematical operator make sum as 37

Through your logical capabilities, can you make 7 an even?

Which number should replace the question mark?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Take away the whole and some still remain. What is it?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Why is the Hole below a Lock?

Three logicians went to bar for having a drink. The bar person asks the logicians "Do they all want to have the drink?". The first logician replied, " I don't know". The second logician replied, " I don't know". What is the reply of the last logician?

What's a single-digit number with no value?