1. Two trains leave from two places 525 kilometers apart at the same time and meet three hours later. One train runs at 90 kilometers per hour, how many kilometers per hour does the other train run?

Solution: suppose another train runs x kilometers per hour, then:

3x+90*3=525

3x=255

X = 85km/h

That is, the other train runs at 85 kilometers per hour.

2. Wang Liang bought a pencil and an exercise book, which cost 0.48 yuan, and the price of the exercise book is twice that of the pencil. What is the unit price format of contact book and pencil?

Solution: If the price of pencil is X yuan, then the price of exercise book is 2x yuan, then:

x+2x=0.48

X=0. 16 yuan

That is, the price of pencil is 0. 16 yuan, so the price of exercise book is 2x=2*0. 16=0.32 yuan.

Mom: My age is four times that of Xiao Fen.

Pink: I am 27 years younger than my mother.

How old are you two?

Solution: Let Pink be X years old, then:

x+27=4x

x=9

That is to say, Xiao fen is 9 years old and her mother is 4*9=36 years old.

4. find the value of a/b/CB/C.

a+b+c=33……( 1)

a+b+a=3 1……(2)

a+b-c=9…… (3)

( 1)-(2): 2c=24

c= 12

Substitute c= 12 into (1) to get a+b=2 1.

From (2): a= 10

Substitute a= 10 and c= 12 into (1) to get b= 1 1.

That is, a =10b =11c =12.