Question

An ore contains 20% zinc. How many kg of ore will be required to get 45 kg of zinc?

Answer 1

In an ore, zinc = 20%

Let quantity of ore = x

∴ 20% of x = 45 kg

`=> 20/100 xx "x" = 45`

`=> "x"/5 = 45`

`=> "x" = 45 xx 5 = 225`

∴ quantity of ore = 225 kg