(32+8)x-38×32=704
40x= 1920
x=48
A: After the expansion, there will be an average of 48 people in each row.
2. Solution: The distance between the two trains is X kilometers.
15 minute =0.25 hour
30×0.25+x=50×0.25
x=20×0.25
x=5
Attendant: The distance between the two trains is 5 kilometers.
3.0.64×380÷4=60.8 (m2) Area: 60.8×60.8=3696.64 (m2).
0.72×380÷4=68.4 (square meter) Square area: 68.4×68.4=4678.56 (square meter).
4. solution: pickup trucks transport x kilograms at a time.
(5+7)x+4.2×5=57
12x=36
x=3
A: The van carries 3 kilograms at a time.
Solution: It takes x hours.
100(8+2)x = 8.75÷3.5÷2
x= 10÷ 1.25
x=8
A: It will take eight hours.
I hope you are satisfied!