the numbers 72,8,24,10,5,45,36 and 15 are grouped together in pairs so that the product of each pair is the same, what # is paired with 10?
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the pairing is should be highest number times lowest number, next highest number times next lowest number, etc. so 72 x 5, 8x45, then 10 x 36 you can infer that 10 is paired with 36 since 5 is paired with 72