Question

4.5 g of an alloy of copper and zinc contains 3.5 g of copper. What weight of copper will there be in 18.9 g of the alloy.

Answer 1

Given that :
1) 4.5 grams of alloy gives ......3.5 grams of copper.
Then,
2) 18.9 grams of alloy gives......? grams of copper.
Let, required weight beY.
# Y = (18.9×3.5)÷(4.5)
# Y = 14.7 grams....
So,
Required weight of copper is 14.7 grams.

Answer 2

Step 1

4.5g of alloy contain=3.5g

1g of alloy contain=3.5÷4.5

that is 0.7777777778

Step 2

1g of alloy contains=0.7777777778

18.9g of alloy contains=0.7777777778×18.9g

thai is 14.7g

So, 14.7g of copper will be there in 18.9g of the alloy