1.

An alloy is made by mixing metal A costing Rs. 2000/kg and metal B costing Rs. 400/kg in the ratio A ∶ B = 3 ∶ 1. What is the cost (in Rs.) of 8 kilograms of this alloy?1). 16002). 98003). 64004). 12800

Answer»

Since RATIO in which A and B are MIXED = 3 ? 1

⇒ Weight of METAL A in 8 kg of alloy = 3/4 × 8 = 6 kg

⇒ Weight of metal B in 8 kg of alloy = 1/4 × 8 = 2 kg

∴ Cost of 8 kg of the alloy = 2000 × 6 + 400 × 2 = Rs. 12800


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