The ratio of three numbers is 1:2:4 and the sum of their squares is 4725. The sum of the numbers is? Options
A) 10
B) 12
C) 15
D) 14
E) 9

Rationale: let the numbers be x , 2 x , 4 x then , x ^ 2 + 4 x ^ 2 + 16 x ^ 2 = 4725 21 x ^ 2 = 4725 x ^ 2 = 225 x = 15 answer is c
Answer: C