Why when expressing agreement in an email or a post, 'agreed' and 'agree' are both used? What is the difference?

For example,

In A's email: B, do you agree with this solution?

In B's email: Agree/Agreed!
If you are explicitly asked whether you agree or not — as is the case in your example — I'd recommend you to answer: "Agree" so that the reply's tense agrees with that of the question.

However, if there's no such question, you may write both agree and agreed.

For example:

A: When it comes to game designers; they can make variations of existing games, that's what happens all the times; Sequels, Re launches and Variations of the same gameplay, packed in a new graphics engine, shinier and bigger, than ever before.

B: Agree (or agreed).

I think that "agreed" is meant as past participle (V3) here, not as a verb in the Past Simple tense.

EDIT: Didn't see Anonymous' post when typing...

Here's my personal approach.

If someone asks me in an email, do you agree with this solution? and I want a clear and simple reply, I'd answer 'I agree'. Is it so important to save the time that it takes to type 'I'?

You could also just answer Yes, which is shorter and will save you even more time!Emotion: wink

Best wishes, Clive
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I agree
It is (It's) agreed
 Ant_222's reply was promoted to an answer.
Got it! Thanks!
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 Clive's reply was promoted to an answer.
Anonymous I agree It is (It's) a greed
Anonymous I agree It is (It's) a greed
This rocks!
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i am agreed with this....is it true or false
davinder brarIs it true or false right or wrong?

It is wrong.

I agree with this.

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