What has lots of keys but can't open any doors?

Answer

Piano/keyboard.

What has lots of keys but can't open any doors?

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Smaller than four, yet bigger than three, to make it your food, you must add an E.
What is it?

You just smashed open your piggy bank and counted 55 coins totaling $10.00.
There are more nickels than pennies, more dimes than nickels, and more quarters than dimes.
How many of each coin is there?

If:
1=3
2=3
3=5
4=4
5=4

So what does...

6=
7=

A hobo picks up cigarette butts from the ground and makes a cigarette with 4 butts. If he finds 16 cigarette butts, how many cigarettes can he make?

In the present moment, I bring joy and sorrow. With every sunrise, but once gone.
What am I?

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A boy buys a female mouse from the pet store and brings it home. If one mouse can give birth to 10 mouselets and after a week, those mouselets can give birth to 10 mouselets and after a week, those mouselets can give birth to 10 mouselets... so on and so on.
How many mice will the boy have after three months?

Look at a digital clock. How many times will the clock show 3 or more consecutive numbers?

Horse A can run 1 lap per minute.
Horse B can run 2 laps per minute.
Horse C can run 4 laps per minute.
If they all start at the same time at the same place, how much long will take for each of them to meet back at the starting line?

I carry my home on my back. I am not rich, but I leave silver in my track.
What am I?

Three men eat dinner in a restaurant. The bill is $25. They each put in $10. The waiter brings back five ones. They give the waiter a $2 tip and keep $1 each. So now each person spent $9. If 3x9=$27, plus $2 for tip = $29, where did the other dollar go?