Question

tammy is 14 years old. she has a younger sister and an older brother. her sister is 12. the mean of all their ages is 14. how old is tammys brother?​

Answer 1

Answer:

16

Step-by-step explanation:

To solve, we can use an equation finding the average of the siblings'ages.

$\frac{14 + 12 + x}{3} = 14 \\ \ 14 + 12 + x = 42 \\ x = 42 - 14 - 12 \\ x = 16$