Question

An alloy is made up of 60% nickel, 7% iron and the rest with copper. Find the weight of copper in a 200 g sample of the alloy.

Answer 1

Step-by-step explanation:

Nickel = 60%

Iron = 7%

Copper = ??

$\rightarrow$ 100% = 60% + 7% + Copper %

$\rightarrow$ 100% = 67% + Copper %

$\rightarrow$ Copper % = 100% - 67%

$\rightarrow$ Copper % = 33 %

Copper in alloy = 33%

Copper amount = 33% of total alloy

$\rightarrow$ 33% × 200

$\rightarrow$ 33/100 × 200

$\rightarrow$ 66 grams.

Copper is 66 grams in the alloy.