Question: the ratio of three numbers is 1 : 2 : 4 and the sum of their squares is 4725 . the sum of the numbers is ?
A) 10
B) 12
C) 15
D) 14
E) 9
Correct answer: C
Grade: 7 | Topic: Ratios and proportions | Difficulty: Easy | Standard: 7.RP.A.3