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

I have eight fingers and two thumbs but I do not live. What Am I?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

What is the next number in the series?

15 29 56 108 208 ?

Can you count the number of triangles in the given picture?

No matter how little or how much you use me, you change me every month. What am I?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Why Aeroplane windows are round?

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

2, 3, 5, 9, 17, _ What is the next number in the sequence?