Can you answer my extremely difficult cat riddle (I bet not!)?

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As I was walking to St Ives
I met a man with seven wives
Each wife was carrying seven sacks
And in each sack were seven cats
Each cat in his particulars
Has seven pairs of Nikon 7x40 binoculars

What is the combined magnification of all the binoculars put together?
 
linear magnification= height of object x object distance from lens
since the lens are 7x40, the problems is easy.
7x40=280
taking reference to the number of binoculars, number of binoculars is (280+63)x7
lens size = number of lens x combined magnification
therefore, (7x40)=(280+63)x7 is the combined magnification.
Horray!
i solved the riddle!
 
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