find the number when added to each the ratio 27:35, changes the ratio to 4;5.
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Let the number be ( k ),
According to the question :
=> 5( 27 + k ) = 4( 35 + k )
=> 135 + 5k = 140 + 4k
=> 5k - 4k = 140 - 135
=> k = 5
Required number is 5
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