Tumblr answers (or "notes" as they're more frequently called) are Tumblr's flavor of blog comments. A user who wants to leave a message on another user's Tumblr blog post can either leave a note or reblog the item on her own blog with a note. If you want to delete a note someone left on your own Tumblr blog post, you can do so in just a few steps.
Sign into your Tumblr account at tumblr.com.
Click on the "# posts" link on the right side of the screen. The "#" will be a number representing the number of posts you have on your Tumblr blog.
Scroll through your posts and locate the post that has a note you'd like to delete, then click the "Notes" link at the top of the post's box.
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Hover over the note and click the "Block" link. The note will be removed from the post.