Question

A gun metal weighing 5 kg consists of 20 parts of copper,
3 parts of tin and 2 parts of zinc, then the copper and zinc
contents are
(a) 4 kg of copper and 0.4 kg of zinc
(6) 4 kg of copper and 0.6 kg of zinc
(©) 4 kg of copper and 0.5 kg of zinc
(d) 4 kg of copper and 0.7 kg of zinc​

Answer 1

Answer:

option (b). 4 kg of copper and 0.6 kg of zinc

Step-by-step explanation:

the ratio between copper, zinc and tin is 20 : 3 : 2

total no. of parts = 20 + 3 + 2 = 25

5 kg ≡ 25 parts

1 part = $\frac{5}{25}$ = $\frac{1}{5}$

copper → $\frac{1}{5}$ × 20 = 4 kg

zinc → $\frac{1}{5}$ × 3 = 0.6 kg

tin → $\frac{1}{5}$ × 2 = 0.4 kg