Three numbers are in the ratio of 2 : 3 : 4. If the sum of the squares of the extremes is 180, then the middle number is:
Choose the correct choice from the following answers
A) 6  B) 12  C) 15  D) 9  E) 7
Number be = 2x,3x,4x, (2x)2 + (4x)2 =180   20x =180⇒x =9⇒x=3,   Midline number=3×3=9   Answer: 9
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Three numbers are in the ratio of 2 : 3 : 4. If the sum of the squares of the extremes is 180, then the middle number is: