Delhi Police Constable Exam Model Paper 1

GIVEN:
A = (7/9) B
C = (4/3) B
CALCULATION:
A : B = 7 : 9
⇒ B = (9/7)A ---- (1)
And, C : B = 4 : 3
⇒ B = (3/4)C
Putting value of B from equation (1), we get
(9/7)A = (3/4)C
⇒ C/A = (9/7) × (4/3)
⇒ C/A = 12/7 = 12 : 7