Question

12 kg of alloy of copper and tin contains 45% of copper. How much pure tin
should be added to the alloy to make copper 40%?​

Answer 1

Answer:

ANSWER

Percentage of copper is 48%

Weight of alloy is 4.2kg

Weight of copper is given by

100

48

×4.2=2.016kg

Percentage of zinc is 24%

Weight of alloy is 4.2kg

Weight of copper is given by

100

24

×4.2=1.008

Percentage of copper is 100−48−24%=28%

Weight of alloy is 4.2kg

Weight of copper is given by

100

28

×4.2=1.176kg