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Jeremy is 4 years older than 2 times the age of his cousin. At the same time, Jeremy is 20 years younger than 4 times the age of his cousin. Whats are the ages of Jeremy and his cousin?

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j = 4 + 2c;
j = 4c - 20;
=> 4 + 2c = 4c - 20 => 4 = 4c - 2c - 20 => 4 = 2c - 20 => 20 + 4 = 2c => 24 = 2c => c = 24 / 2 => c = 12 years(  the age of his cousin );
j = 4 + 2 * 12 => j = 4 + 24 => j = 28 years( tha age of Jeremy )

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