Product of Unknowns #1 | PuzzledQuant

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Four real numbers $W, X, Y, Z$ have the six pairwise products

$WX = 35,\quad WY = 15,\quad WZ = 30,\quad XY = 21,\quad XZ = A,\quad YZ = 18.$

What is $A$ ? Give your answer as an integer.

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