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Explanation:

The fastest way to solve this sum is by substituting the values of x and y from the options.

For x = 5 and y = 2, the first equation becomes

20.7x × 3−1.25y  = 20.7× 5 × 3−1.25 × 2

              = 27/2 × 3−5/2

             = 8627

These values of x and y satisfy the second equation also.

Hence, option (e).

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