According to the meaning of the question, {x+4y=26.

2x+4.5y=3 1

The solution is {x=2.

y=6

6×2.5= 15 (cm)

Answer: The width of the tongue is 2cm, and the height of the paper box is 15cm. ..

(2) Let the diameter of the bottle bottom be dcm.

{4d+2≤35

4.5d+4≤40

Solution: d≤8

Answer: The diameter of the bottom surface of this pen container can reach 8cm.