SOLUTION: Tyler is three-fourths of his brother's age. The sum of their ages is 21. How old is Tyler?

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Question 465725: Tyler is three-fourths of his brother's age. The sum of their ages is 21.
How old is Tyler?
Answer by sofiyac(983) About Me  (Show Source):
You can put this solution on YOUR website!
Brother will be x
Tyler will be 3x/4
x+3x/4=21
4x/4+3x/4=21
7x/4=21 multiply each side by 4/7
x=12
so brother is 12
and tyler is 12*3/4=9