1.

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»

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}}


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