Answers

2016-02-28T15:24:21+05:30
123:4: :726:?
Let ? be x
123/4 = 726/x
123/4x = 726
x = 726/
123/4 = 2904/123 = 23

123:4: :726:23

And is u want reasoning answer then:
123:4: :726:? 
12 = 3*4
72 = 6*12

123:4: :726:12

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2016-02-28T18:06:32+05:30
In maths the ans is 23.609
and in reasoning ans is 12.
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