Charlie is x years old. His sister is 4 years younger than charlie. His mother's age is 3 times the quantity of her childrens age. Write an expression to show his mothers age

6x - 12

Step-by-step explanation:

In this question, we area asked to write an expression for a mother's age given some information about the children's age. We proceed as follows:

Charlie is x years old and his sister is 4 years younger. His sister's age would be x - 4. The total of both ages would be their addition and that is x + x - 4 = 2x - 4

Now, the mother's age is 3 times this quantity.

Mathematically, that is 3 (2x - 4) = 6x - 12

The expression of the mother's age is (6x-12) years