If roy is 4 years older than his younger brother and the product of their ages is 165, how old is roy's younger brother

Roy is 4 years older than his younger brother, Both the ages together are 165. So, I would divide 165 by 2, That gives me 82.5 minus by 4 because he is 4 years younger 72.5. He is 72 years old!

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3were boys and 5 were girls