Look at your answer. If Sean's brother is 12 now, how could he have been 5 years old five years ago?
Sean's age years ago:
Sean's brother's age years ago:
Sean's age years ago was 3 times as old as Sean's brother's age years ago.
Sean is 20 and his brother is 12. How many years ago was Sean three times as old as his brother?
20 - x = 3(x)
20 - x = 3x
20 = x + 3x
20 = 4x
20/4 = x
5 = x
Sean's current age is 20.
Sean's age some years ago is 20 - x.
I just found x to be 5.
So, 20 - 5 = 15.
15 is three times more than 5.
So, when Sean was 15 years old, his brother was 5.
Is this correct?