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    Work: Find the solution of equation 1/60*20+(1/60+1/90)A = 1 .
    Question type: Equation
    Solution:Original question:

1

÷

60

×

20

+

(

1

÷

60

+

1

÷

90

)

A

=

1

Left side of the equation =

1 3

+

(

1

÷

60

+

1

÷

90

)

A

    The equation is transformed into :

1 3

+

(

1

÷

60

+

1

÷

90

)

A

=

1

    Remove the bracket on the left of the equation:

Left side of the equation =

1 3

+

1

÷

60

×

A

+

1

÷

90

×

A

=

1 3

+

1 60

A

+

1 90

A

=

1 3

+

1 36

A

    The equation is transformed into :

1 3

+

1 36

A

=

1

    Transposition :

1 36

A

=

1

−

1 3

    Combine the items on the right of the equation:

1 36

A

=

2 3

    The coefficient of the unknown number is reduced to 1 :

A

=

2 3

÷

1 36

=

2 3

×

36

=

2

×

12

    We obtained :

A

=

24

    This is the solution of the equation.

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