Question

an alloy contains copper and zinc in the ratio 7:3 .if it contains 12.6 g of copper,how much does this alloy weigh?

Answer 1

Hi friend
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Your answer
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In an alloy,

Copper : Zinc = 7 : 3

Weight of Copper = 12.6 grams

Now,
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Total parts= (7 + 3) = 10

Let the weight of the alloy be x.

Then,

7/10 × x = 12.6

=> x = (12.6 × 10)/7

=> x = 18 grams

∴ Weight of the alloy is 18 grams.

HOPE IT HELPS

Answer 2

Answer:

copper:zinc =7:3

weight of copper is 12.6g

total weight 7+3 = 10

let the alloy be x

7/10 × x = 12.6

x=18g