Title: Xiaojun is doing a math division problem. He mistook the dividend 25 1 for 2 15, making the quotient smaller than the correct quotient by 4 and the remainder the same as the correct remainder. Please work out the correct divisor and quotient.

Answer: (25 1-2 15)÷4=9.

25 1÷9=27...8

The divisor is 9, the quotient is 27 and the remainder is 8.

Question: What are the numbers of A, B and C in the third grade of primary school?

○+□=45

□+△=53

△+○=62

○=( )

□=( )

△=( )

Answer: Solution: ○+□=45 (1)

□+△=53 (2)

△+○=62 (3)

Sequence (3)-(2): ○-□=9 (4)

Sequence (4)+( 1): 2○=54 ○=27.

□=45-○=45-27= 18

△=62-○=62-27=35

So ○=(27)

□=( 18)

△=(35)

Title: Xiaogang and Xiaoqiang play puzzles, and the number of their pictures is the same. After Xiao Gang used 39 pictures, Xiao Qiang had three times as many pictures as Xiao Gang. So how many pictures does Xiaogang have?

Answer: Suppose Xiao Gang has X pictures now.

x+39=3x

2x=39

x= 19.5

19.5+39=58.5 sheets

Title:

1/3,2/3, 1/3, 1/4,2/4,3/4,2/4, 1/4, (), (), (), ()

Answer:1/52/53/54/53/52/51/5.

Denominators are 3 and 4, so the next one is 5.

The numerator is 1, 2, ... and the denominator is-1, ..., 2, 1.