Question

an ore contains 5% copper how much ore is required to obtain 400g of copper

Answer 1

Let ,

The amount of ore be x kg

Given,

Total amount of Copper

= 400g

= 0.4 kg

A/Q,

5% of x = 0.4

=> 5/100 × x = 0.4

=> 5x = 40

=> x = 40/5

=> x = 8kg

So,

Total amount of ore = 8kg or 8000g

Hope it helps !!

Answer 2

Dear Student,

● Answer -

8 kg ore

◆ Explanation -

Given that an ore contains 5% copper.

Let x be amount of ore required to obtain 400 g copper.

5% of x = 400 g

5/100 × x = 400

x = 400 × 100 / 5

x = 400 × 20

x = 8000 g

x = 8 kg

Hence, 8 kg ore is required to obtain 400 g of copper.

Thanks dear. Hope that helps you...