The trunk of a certain tree is 50 cm thick now. Each year it gets thicker by 1cm. How thick will the tree trunk be in 25 years? ?

Answer 1

What is the definition of 'thick'?  Is it the diameter or the circumference that increases by 1 cm?  You cannot correctly answer without further information

Answer 2

75 cm  - if the thickness is the rate the diameter increases.

Answer 3

Surely 100cm. 25 years is 25cm each side, plus the original 50 is 100.

Answer 4

75 cm