book Maths Puzzle Numerical Ability

6/7 = 13/n what is n ?

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The owners of ABC video discovered that they had no movies in common with XYZ video and bought XYZ’s entire stock. Although XYZ had 200 titles, they had no children’s movies, whil im lookin for some help with some problems that involve shapes and angles that i can not show on here cuz u can't show shapes or dram grids..im looking for a tutor i can email the