college algebra
posted by sue .
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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