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

x+3=57

54

To find the equation for this, let's denote Alex's age as x. Since his sister is 3 years older, her age would be x + 3.

Now, according to the given information, the sum of their ages is 57. Therefore, the equation can be written as:

x + (x + 3) = 57

Simplifying the equation, we have:

2x + 3 = 57

This equation can then be solved to determine the value of x, which represents Alex's age.