6- 1 = 5 (layer)

42 ÷ 14 = 3 (m)

3× 5 = 15 (m)

A: Xiaohong's floor is off the ground15m.

Question 3:1/3 ÷ 3 =1/3×1/3 =1/9.

1/9×8=8/9

1-8/9= 1/9

Answer: You can enter 8/9 of this paper, leaving 1/9.

Question 4: 240× 3/4 = 180 (kg)

180 ÷ 1/4 = 720 (bag)

They have filled 720 bags.