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Posted by sue on Sunday, September 4, 2011 at 5:49pm.

10 1/2 of what number is 42.

10 1/2 = ( 20 / 2 ) +( 1 / 2 ) = 21 /2 42 = 84 / 2 42 / ( 10 1/2) = ( 84 / 2 ) / ( 21 / 2 ) = 84 / 21 = 4

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