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

What does this rebus mean?

O
N
C
E
TIME

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

Which is heavier: a ton of bricks or a ton of feathers?

If six children and two dogs were under an umbrella, how come none of them got wet?

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Find the next number in the series below

21 32 54 87 131 ?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?