Spot what is wrong here in below Picture?

When is the top of a mountain similar to a savings account?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Here is a Swiss Cross. You have to make two straight cuts in the figure so that it is divided into four congruent pieces. Also, you should be able to join these pieces into a square then. Can you accept this challenge?

A pet show was happening in my locality. I went down along with my kids. In that show, I noticed that all except two of the entries were cats. All except two were dogs and all except two were Monkeys.

Can you find out how many of each animals were present in that pet show?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?