There are two alloys P and Q made up of silver, copper and aluminium

There are two alloys P and Q made up of silver, copper and aluminium. Alloy P contains 45% silver and rest aluminum. Alloy Q contains 30% silver, 35% copper and rest aluminium. Alloys P and Q are mixed in the ratio of 1 : 4.5. The approximate percentages of silver and copper in the newly formed alloy is

  1. 33% and 29%
  2. 29% and 26%
  3. 35% and 30%
  4. None of the above

Solution

P and Q are mixed in the ratio 1 : 4.5

Assume that 1 kg of P is mixed with 4.5 kg of Q.

1 kg of P has 0.45 kg of silver and 0.55 kg of aluminium.

4.5 kg of Q has 1.35 kg (0.3 × 4.5) of silver and 1.575 kg (0.35 × 4.5) of copper.

The newly formed alloy of 5.5 kg has 1.8 kg of silver and 1.575 kg of copper.

Percentage of silver 33 and percentage of copper = 29

The correct option is A.