The ratio of three numbers is 1:2:4 and the sum of their squares is 4725. The sum of the numbers is?  Choose the correct answer.
A) A)10  B) B)12  C) C)15  D) D)14  E) E)9
Let the numbers be x,2x,4x   then, x^2+4x^2+16x^2 = 4725   21x^2 = 4725   x^2 = 225   x=15   Answer is 15
<result>C</result>
The ratio of three numbers is 1:2:4 and the sum of their squares is 4725. The sum of the numbers is?