The most difficult problem in junior one mathematics. Brother and sister help. Little sister, get down on your knees and thank you.

(1). Solution: Let worker X make part A and worker Y make part B..

There are braces here, you can't type ... dual format, you know.

x+y= 190

2*8x=22y

Solution: x= 1 10, y=80.

(2) Solution: Assume that Task A produces X parts in February and Task B produces Y parts.

X+Y=500

( 1+ 10%)X+( 1+20%)Y = 570

Solution: x=300, y=200.

(3) Solution: Let him ride a bike for X hours and walk for Y hours.

x+y= 1.5

15x+5y=20

Solution: x= 1.25, y=0.25.

(4) Solution: Let each train be X tons and each carriage be Y tons.

8X+ 15Y=460

6X+ 10Y=340

Solution: x=50, y=4.

(5) pinch the table?

The process of solution ... is too long. ...