# an alloy contains tin and copper in the ratio

questioned by administrator @ in Math viewed by 150 People

An alloy contains tin n copper in the ratio 4:5.if tin has 20% impurity and copper has 58%,wat is the average impurity?

tin = 4/9 , copper = 5/9

impurity in, tin =4/9 *20% = 8/90 , copper = 5/9 *58% = 29/90

total impurity = (8/90 +29/90) = 37/90

% impurity = 37/90 *100 = 41 % approax

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