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

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

What is always in front of you but can’t be seen?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?

The cream is heavier than Milk. True or False?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?