Answer:
The answer is 20
Step-by-step explanation:
Given;
- Mariana is the youngest of four siblings.
- The sum of their ages is 86
To Find;
Now, we know that their ages are consecutive integers.
Let their ages be (x), (x + 1), (x + 2) and (x + 3). Where, Mariana's age is x.
Here, The sum of their ages is 86.
(x) + (x + 1) + (x + 2) + (x + 3) = 86
x + x + 1 + x + 2 + x + 3 = 86
4x + 6 = 86
4x + 6 – 6 = 86 – 6
4x = 80
4x/4 = 80/4
x = 20
We assumed that Mariana's age is x and the value of x is 20.
Thus, The age of Mariana is 20.
