2X+3( 10-X)=26

X=4

10-X= 10-4=6

There are four bicycles and six tricycles.

2. Suppose Zhang Peng made nine three-pointers and nine two-pointers.

3X+2(9-X)=2 1

X+ 18=2 1

X=3

A: Zhang Peng made three three-pointers.

3. Suppose there are x big steel balls and 30-X small steel balls.

1 1X+7(30-X)=266

4X=56

X= 14

30-X=30- 14= 16

Answer: Big steel ball 14, small steel ball 16.

4.( 1) Let's assume that player 2 answered question X correctly and 8-X incorrectly.

10X-6(8-X)=64

16X= 1 12

X=7

A: Player No.2 answered seven questions correctly.

(2) Suppose the player 1 answers the wrong question X and answers the right question10-X..

10( 10-X)-6X=36

16X=64

X=4

A: Player 1 got 4 questions wrong.

(3) Suppose player No.3 answers question X correctly and misses question16-X..

10X-6( 16-X)= 16

16X= 102

X=7

A: Player No.3 answered seven questions correctly.