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Cultivate excellent homework math problems! ~
1. There are X students in the school art interest class and Y students in the computer interest class.

X+Y= 102

(2/9)X=( 1/4)Y

X=54,Y=48。

A: There are 54 students in the school art group and 48 students in the computer group.

There are x girls and y boys in this school.

X=(2/5)(X+Y)+40

Y=(4/3)X

X=600,Y=800。

X+Y= 1400

There are 1400 students in this school.

3. Set up original rice X bag and original powder Y bag in the canteen.

X=Y

X- 18=(5/8)(Y-6)

X=Y=38。

Answer: There are 38 bags of rice and 38 bags of flour in the canteen.

There are x people in class a and y people in class b.

X+Y=84

(5/8)X+(3/4)Y=57

X=48,Y=36。

A: There are 48 students in Class A and 36 students in Class B..

5. Set the total length to S km.

Total round-trip time =S/3+S/6=S/2.

Total round-trip distance =2S

Average round-trip speed =(2S)/(S/2)=4.

Attendant: The average round-trip speed is 4 kilometers per hour.