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One alloy contains 30% copper and another 70% copper. How many kg of the first alloy are needed to make 50 kg of an alloy containing 46% copper?

Competition practiceRatio, Proportion & Mixtures

A30 kg
B20 kg
C25 kg
D35 kg

Step-by-Step Solution

First : second

= (70 - 46) : (46 - 30) = 24 : 16 = 3 : 2

. First

= 50 \times \frac{3}{5} = 30

kg.

Answer: A) 30 kg

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