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Sticky Note
If an alloy contains copper and silver in the ratio 3:7, then the percentage quantity of silver to the alloy is?
  1. 90%
  2. 60%
  3. 70%
  4. None of these
Explanation

Given:

Copper : Silver = 3 : 7

Step 1: Find total parts

3+7= 10

Step 2: Silver = 7 parts

Silver percentage= 7/10 x100

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