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Cristina's age is equal to three time her age in three years time minus three time her age three years ago How old is Cristina?
Wiki User
∙ 14y ago
Use a convenient variable, such as "x", for her age. Then, 3 years ago her age was x-3, in three years, her age will be x+3. Write an equation with this data:
x = 3(x+3) - 3(x-3)
And solve it:
x = 3x + 9 - 3x + 9
x = 18
Use a convenient variable, such as "x", for her age. Then, 3 years ago her age was x-3, in three years, her age will be x+3. Write an equation with this data:
x = 3(x+3) - 3(x-3)
And solve it:
x = 3x + 9 - 3x + 9
x = 18
Use a convenient variable, such as "x", for her age. Then, 3 years ago her age was x-3, in three years, her age will be x+3. Write an equation with this data:
x = 3(x+3) - 3(x-3)
And solve it:
x = 3x + 9 - 3x + 9
x = 18
Use a convenient variable, such as "x", for her age. Then, 3 years ago her age was x-3, in three years, her age will be x+3. Write an equation with this data:
x = 3(x+3) - 3(x-3)
And solve it:
x = 3x + 9 - 3x + 9
x = 18
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoUse a convenient variable, such as "x", for her age. Then, 3 years ago her age was x-3, in three years, her age will be x+3. Write an equation with this data:
x = 3(x+3) - 3(x-3)
And solve it:
x = 3x + 9 - 3x + 9
x = 18
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