1.

28-25 years old =3 years old

28+(28-27)+(28-26)+(28-25)=34 years old

2.( 1)4 1

(2) 2 in1.

(3) 1 in 6.

3. (1) (150+200+250+230+200) ÷ 5 = 206m.

200-40 =160m

P54:

1.

6×4= 12×2

∴B: 12

C: 18

D:6

Einstein: 4

F: No.3.

2.( 1)70÷35=2

2÷2= 1

(2) Solution: the station is x meters.

35x=42×2

35x=48

x=84÷35

x=2.4

A: Liangliang should stand at a distance of 2.4 meters.

3.200÷50=4

(Draw by yourself ...)

Adopt it