Ratio: 3.5 : 2.5 = 7 : 5. Difference = 2 units. 2 units = 420 => 1 unit = 210. Total = (7+5) * 210 = 12 * 210 = ₹2520.
अनुपात: 3.5 : 2.5 = 7 : 5। अंतर = 2 इकाइयाँ। 2 इकाइयाँ = 420 => 1 इकाई = 210। कुल = (7+5) * 210 = 12 * 210 = ₹2520।