Question

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

Answer 1

The ratio of weight of copper and zinc in brass is 13 : 7.

Let the weight of the copper be 13x.
Weight of zinc be 7x.

From the given information,

Given weight of brass = 700 gm

Weight of copper in brass + weight of zinc in brass = 700 gm

$$\begin{gathered} 13x+7x=700 \\ \therefore 20x=700 \\ \therefore x=35 \end{gathered}$$

∴ Weight of zinc in brass = 7 × 35 = 245 gm

Hence, the weight of zinc in a brass utensil is 245 gm.