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    Work: Find the solution of equation （1-65％）X = 28 .
    Question type: Equation
    Solution:Original question:

(

1

−

65 100

)

X

=

28

    Remove the bracket on the left of the equation:

Left side of the equation =

1

X

−

65 100

X

=

7 20

X

    The equation is transformed into :

7 20

X

=

28

    The coefficient of the unknown number is reduced to 1 :

X

=

28

÷

7 20

=

28

×

20 7

=

4

×

20

    We obtained :

X

=

80

    This is the solution of the equation.

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