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  1. An metallic alloy contains 20g copper, 20g tin and 40g silver.Then find out the percentage of tin in the alloy?
    1. 20%
    2. 30%
    3. 25%
    4. 40%
Correct Option: C

Total weight of alloy = 20+20+ 40 = 80g
Weight of tin = 20g
Percentage of tin = 20g/80g x 100
=25%


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