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People's education edition, the first volume of sixth grade mathematics, 1 16 pages, the equation reference answer is urgent! ! ! ! ! ! !
4.

(1) Solution: Suppose she is right about X and wrong (8-X).

10X-6(8-X)=64

10X-6×8=6X=64

16X=64+48

X=7

(2) Solution: Suppose he is right about X and wrong (10-X).

10X-6( 10-X)=36

10X-6× 10+6X=36

X=6

10-6=4 (Road)

(3) Solution: Suppose she got X right and wrong (16-X).

10X-6( 16-X)= 16

10X-6× 16+6X = 16

X=7

5. Solution: Suppose there are X groups in science and technology and (9-X) groups in art.

5X+3(9-X)=37

5X+3×9-3x=37

X=5

Science and technology category: 5×5=25 (person)

Art category: 37-25= 12 (person)

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