A trout's tail weighs eight pounds.

Its head weighs as much as the tail and one-half of the body combined, and the body weighs as much as the head and tail combined.

What does the whole trout weigh?

What is made from nothing...

...yet you can see it?

I recently went to the shop and purchased 4 items.

Three of the items cost:

$1.50
$3.00
$4.00

There was quite a long queue, and as I was quite bored, I was playing with my pocket calculator whilst waiting.

Very curiously, the 4 prices added to the same number as I got when I multiplied the 4 prices together.

What was the price of the 4th item?

Which is greater:

the number of seconds in a year or miles light can travel in 3 minutes?