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Answer :
Six boys download six songs in six days.
Twelve boys download twelve songs in six days..
Twelve boys download twenty-four songs in twelve days.

Four girls download four songs in four days.
Twelve girls download twelve songs in four days.
Twelve girls download thirty-six songs in twelve days.

Therefore : Twelve boys and twelve girls download 24 + 36 = 60 songs in twelve days.

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