Sentence 1: Its volume declined from 12.

Sentence 2: Its volume went down by only 10.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: And don't think the Satheri can't pull a lot worse than that.

Sentence 2: You've seen the worst the Satheri can do now.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: She felt, and rightly, that before the strain of attempting further intercourse with Albert, it would be as well to fortify herself with a good supply of local colour.

Sentence 2: Intercourse with Albert would be further improved by fortifying herself with some local color.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell