Answer :
Answer:
C.
Step-by-step explanation:
15+14+13=42
Hope this helps :)
The age of the oldest sibling is 15 years old.
What is consecutive number?
Numbers that follow each other continuously in the order from smallest to largest are called consecutive numbers.
Here, let the age of youngest sibling be x years
the age of middle sibling be (x+1) years
the age of oldest sibling be (x+2) years
According to question,
x + (x+1) + (x+2) = 42
3x + 3 = 42
3x = 39
x = 13
Thus, the age of the oldest sibling is (x+ 2) years = 15 years old.
Learn more about Consecutive number from:
https://brainly.com/question/864749
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