Question

An alloy has aljminium and copper in the ratio 9:1 . a. Find the percentage of aluminum in it? b. If a coin is made of the alloy weighs 20 g, find the weight of aluminum in it ?

Answer 1

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Answer:

90 pc of the alloy is aluminium.

18 gram of aluminium is present in the 20 gram of alloy.

Step-by-step explanation:

Here,

Ratio of aluminium to copper=9:1

Sum of the terms=9+1=10

Thus percentage of aluminium in the alloy=9*100/10=90 pc

ATP

Weight of the alloy=20 g

Thus weight of aluminium in the coin= (90 *20/100)g=18 g