4,575 divided by 75 is 61.
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4575 = 3 x 5 x 5 x 61
The average is obtained by adding the numbers and dividing by the number of numbers (in this case two)... so 4566+9=4575... then 4575/2 is... 2287.5 (the answer)
LCD(21, 45) = 315
21
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