For the following:

Question

(a) John is angry because Mary murdered the platypus
(b) Mary murdered the platypus

The answer:

A. (a) entails (b)

B. (a) presupposes (b)

C. Both

Answer 1

Now it's your turn. What do you think?

Answer 2

Both entails and presuppposes?

Answer 3

Did John know about the murder first? Or did she murder the platypus first?

Answer 4

she murdered the platypus first

Answer 5

Then I think it's only (a).

Read through the ANSWER (don't worry about the questions) here:
http://www.lingforum.com/forum/viewtopic.php?p=15688&sid=90471e2bf2fd965f41c4e1df71a0be62