10 grams of Iron should be added to Nickel to make the alloy.
20% of the alloy is made of Iron and 80% is Nickel.
The weight of Nickel given so you can use this to find the total weight of the alloy assuming that total weight is x.
40 grams = 80% × alloy x
Alloy x = 40 / 80%
= 50 grams
Iron should be 20% of the full weight of the alloy:
= 20% x weight of Alloy x
= 20% x 50
= 10 grams
In conclusion, 10 grams of Iron should be added to create the alloy.
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