By calculation, Beth is 18 years old if her brother is 12 years old
How to determine old how is Beth?
From the question, we have the following parameters that can be used in our computation:
Beth is 6 years younger than twice her brother's age
This means that
y = 2x - 6
Where
x = her brother
y = Beth
Given that
Her brother is 12 years old, we have
y = 2 * 12 - 6
Evaluate
y = 18
Hence, Beth is 18 years old
Question
Beth's brother is 12 years old. Beth is 6 years younger than twice her brother's age. How old isBeth?