Question

5g of alloy of copper and zinc contain 3.5g of copper. what weight of copper will there be in 18.9 g of alloy?

Answer 1

Given:
⇒ Weight of alloy of Copper and Zinc = 5g
⇒ Weight of Copper in 5g of alloy = 3.5g

To find:
⇒ Weight of Copper in 18.9g of alloy = ?

Solution:
⇒ Weight of copper in 1g of alloy = 3.5/5
                                                         = 0.7g
⇒ Weight of copper in 18.9g of alloy = 18.9 × 0.7
                                                              = 13.23g

⇒∴ Weight of Copper in 18.9g of alloy = 13.23g                                                   

:)