alex is x years old his sister is 3 years older , togerther their age is 57. what is the equation for this.

x+x+3=57

27x

To find the equation representing the given situation, we can use algebraic expressions.

Let's assume Alex's age is represented by x.
Since Alex's sister is 3 years older, her age can be represented as (x + 3).

Together, their age is 57. Therefore, the equation representing this situation is:
x + (x + 3) = 57

We can simplify this equation to find the value of x.