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YUSUFALI : So they stayed in their Cave three hundred years, and (some) add nine (more)

PICKTHAL : And (it is said) they tarried in their Cave three hundred years and add nine.

SHAKIR : And they remained in their cave three hundred years and (some) add (another) nine.

M& HILALI : And they stayed in their Cave three hundred (solar) years, and add nine (for lunar years).