The equation that can be used to represent the ages of Sarah and his brother will be 2x - 12 = 16.
From the question given, Sarah's brother is 12 less than twice her age and Sarah is 16.
Let Sarah's age be represented by x.
Therefore, the equation to represent the situation will be:
= (2 × x) - 12 = 16
2x - 12 = 16
2x = 16 + 12.
2x = 28
x = 28/2 = 14
Sarah is 14 years.
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