what does the below rebus means?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

Identify the 10 differences between the two given pictures.

A Shopkeeper collects 71 rupees in the form of 20 paisa and 25 paisa.
He collects a total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

What makes this number unique: 8,549,176,320?

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

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?