y-x=27

y/x=4

Solution: x=9 y=36

2. Poplar =x pine = Y.

x+y=24

x/y=2

Solution: x= 16 y=8.

Let's meet in t hours.

1 10*t+80*t=570

Solution: t=3

4: A meter =x B meter = y.

x/y=2

x- 15=y+ 15

Solution: x=60 y=30

5. Sister stamp =x brother stamp = Y.

x=3y

x-6=y+6

Solution: x= 18 y= 12.

Note: pay attention to the format, the above is just the solution.

Children should study hard!