Question

The ratio of copper and iron in an alloy is 4:5 .If there is 25% impurity in copper then find the amount of impurity
in 18 kg of the alloy.

Answer 1

Take the total weight and divide by the total number of parts.
Multiply by the # of parts of copper.
Find out what 25% of that is.

Answer 2

I didn't get you. Can you show the working please?

Answer 3

in the ratio 4:5 there is 8 kg of copper to 10kg of iron

25% impurity in copper then

25% of 8 = 2

so 2kg of impuirty

Answer 4

Thank you so much! :))

Answer 5

hope it helps

Answer 6

It did. :)