The sum 4

The sum of Robin's age is 45. Seven years ago, Robin was 16 years more than one half as old as Bruno then. How old is Bruno?

Correct answer:

B =  17

Step-by-step explanation:

B+R = 45
(R-7) = 16+(B-7)/2

B+R = 45
B-2R = -39

B = 17
R = 28

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