the number which when subtracted from each of the terms of the ratio 19:31 reducing it to 1:4 is question mark
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Let,
Number = n,
SO,
19-n : 31-n :: 1 : 4,
OR,
4(19-n) = 31-n, ===> 76-4n = 31-n,
OR,
-4n +n = 31 -76, ===> -3n = -45,
OR,
n = 45/3 = 15
Number = n,
SO,
19-n : 31-n :: 1 : 4,
OR,
4(19-n) = 31-n, ===> 76-4n = 31-n,
OR,
-4n +n = 31 -76, ===> -3n = -45,
OR,
n = 45/3 = 15
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