carol is 5 times alice ’ s age but only twice as old as betty . alice is 12 years younger than carol . how old is betty ?
Pick:
A) 6
B) 9
C) 12
D) 18
E) 24

Rationale: given that c = 5 a = 2 b . . and a = c - 12 = 5 a - 12 - - > 4 a = 12 - - > a = 3 substituting the values a = 3 , c = 15 and b = 6 . . ans a = 6 . .
Answer: A