I’m tall when I’m young, and I’m short when I’m old. What am I?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

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

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

All Marigolds are flowers.
Few Flowers are used to make colors.
Therefore, some Marigold are used to make colors.

True Or False?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

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