An alloy contains lead and aluminium in the ratio 3 ∶ 5. If lead has 15% impurity and aluminum 55%, what is the average impurity percentage of the alloy?

An alloy contains lead and aluminium in the ratio 3 ∶ 5. If lead has

1.	An alloy contains lead and aluminium in the ratio 3 ∶ 5. If lead has 15% impurity and aluminum 55%, what is the average impurity percentage of the alloy?
A.	30%
B.	40%
C.	22%
D.	35%
Answer» C. 22%

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An alloy contains lead and aluminium in the ratio 3 ∶ 5. If lead has 15% impurity and aluminum 55%, what is the average impurity percentage of the alloy?

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