Question

An ore contains 5% copper, How much ore is required to obtain 400 g of copper?
(a) 2 kg
(b) 4 kg
(c) 6 kg
(d) 8 kg​

Answer 1

Answer:

b)4 kg

Step-by-step explanation:

4 kg is the answer

Answer 2

Step-by-step explanation:

Percentage of Copper in an ore = 5%

Required Copper = 400 g

Mass of ore Required = Let be x

Hence,

5% of x = 400

5/100 × x = 400

5x/100 = 400

x = 400×100/5

x = 400 × 20

x = 8000 g

Hence

Mass of ore Required is 8 kg