How many kilograms of wheat costing ₹52 per kg must be mixed with 30 kg of wheat costing ₹40 per kg so that a 20% gain may be obtained by selling the mixture at ₹54 per kg?

উত্তর দেখান ও ব্যাখ্যা

উত্তর: (B) 21.4 kg

ব্যাখ্যা

Mixture CP = 54/1.2 = ₹45. By alligation 52 : 40 = 5 : 7, so x = 30 × 5/7 ≈ 21.4 kg.