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100

What has keys but can’t open locks?

A Piano

100

How many times can you subtract 10 from 100?

Once

100

What five-letter word becomes shorter when you add two letters to it?

Short

200

What has a head, a tail, is brown, and has no legs?

A Penny

200

I am an odd number. Take away one letter and I become even. What number am I?

Seven

200

I have branches, but no fruit, trunk, or leaves. What am I?

A Bank

300

Forward I am heavy, but backward I am not. What am I?

Ton

300

I am a band that does not play music. What am I?

A Rainbow

300

What is always coming but never arrives?

Tomorrow

400

What has a neck but no head, two arms but no hands?

A Shirt

400

What has a heart that doesn’t beat?

An artichoke

400

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

A Candle

500

I'm not alive, but I can grow; I don't have lungs, but I need air; I'm not thirsty, but I can die if I don't drink. What am I?

A Balloon

500

I am taken from a mine, and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Pencil Lead

500

I go on four legs in the morning, two legs at noon, and three legs in the evening? What am I?

A Human