What happened when the wheel was invented?

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

Which alphabet letter is a question?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

How many times can you subtract the number 5 from 25?

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

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

Can you place six X (crosses) in below board without making three in a row in any way ?

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?

What has one letter and starts with an E?