Rajasthan Police Constable Model Paper 8

Let the number which we subtract is P.
Based on given condition: -
(17 - P) : (22 - P) : : (32 - P) : (42 - P)
⇒ (17 - P) × (42 - P) = (22 - P) × (32 - P)
∴ On solving the equation, we get P = 2