What has one letter and starts with an E?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

Can you count the chocolates in hand?

I have an eye but still cannot see.

Who am I?

If a wheel has 54 spokes, how many spaces are there between the spokes?

What is more useful when it is broken?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

How can you take 2 from 5 and leave 4?