Question

The ratio of weights of copper and zinc in brass is 13:7. Find the weight of zinc in a brass utensil weighing 700 gm.

Answer 1

ratio of weights of copper and zinc in brass is 13 : 7 .
Let proportionality constant is x
then, weight of copper = 13x
weight of zinc = 7x

A/C to question,
Given, weight of brass = 700 gm
weight of copper in brass + weight of zinc in brass = 700 gm
=> 13x + 7x = 700
=> 20x = 700
=> x = 35

hence, weight of copper in brass = 13 × 35 = 455 gm
$\text{\bf{weight of zinc in brass = 7 . 35 = 245 gm}}$

Answer 2

Heya..

Here's your answer.....

Let the numbers in the ratio be 13x and 7x

It means weight of copper = 13x

Weight of zinc = 7x

Given, weight of brass = 700 gm

According to the question,

13x + 7x = 700

20x = 700

x = {700}/{20}

x = 35

Weight of copper = 13x = 13 × 35 = 455 grams

Weight of zinc = 7x = 7 × 35 = 245 grams

Thanks...!!!

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