1.

Zinc and copper are in the ratio of 5 : 3 in 400 gram of an alloy. How much gram of copper should be added to make the ratio of zinc to copper as 3 : 5?1). \(133\frac{1}{3}\)2). 2/33). \(266\frac{2}{3}\;\)4). 260

Answer»

Zinc and copper are in the ratio 5 : 3

Zinc in 400 gm of ALLOY = 400 × 5/8 = 250 gm

Copper in 400 gm of alloy = 400 – 250 = 150 gm

x gram of copper is ADDED to make the required ratio,

$(\Rightarrow \frac{{250}}{{150\; + x}} = \frac{3}{5})$

⇒ 1250 = 450 + 3x

⇒ 3x = 800

$(\Rightarrow x = \frac{{800}}{3} = 266\frac{2}{3})$



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