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    Work: Find the solution of equation x/(x+1600)*100% = 20% .
    Question type: Equation
    Solution:Original question:

x

÷

(

x

+

1600

)

×

100 100

=

20 100

Multiply both sides of the equation by:

(

x

+

1600

)

x

×

100 100

=

20 100

(

x

+

1600

)

    Remove a bracket on the right of the equation:：

x

×

100 100

=

20 100

x

+

20 100

×

1600

    The equation is reduced to :

x

×

100 100

=

20 100

x

+

320

    Transposition :

100 100

x

−

20 100

x

=

320

    Combine the items on the left of the equation:

4 5

x

=

320

    The coefficient of the unknown number is reduced to 1 :

x

=

320

÷

4 5

=

320

×

5 4

=

80

×

5

    We obtained :

x

=

400

    This is the solution of the equation.

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