What four weights can be used to balance from 1 to 30 pounds?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Which tank will fill first?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Forwards I am heavy, backward I am not. What am I?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

If two's company, and three's a crowd, then whats four and five ?

Can you find a five letter word that is left with only two letters if one is removed?