SOLUTION: Jenny is 20 years younger than her mother. Using x to represent Jenny's age, write down an expression for her mothers age. The sum of heir ages is 4 times Jenny's age.

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Hi

Jenny's age x

mother's age: x+20

 x + (x+20) = 4x

    2x + 20 = 4x

        20 = 2x,  x = 10, Jenny's age.  MOther is 30