Question

Hello plz help 5 th on the top

Answer 1

Given,
Amount of alloy=20kg
Percentage of copper=30%
Percentage of zinc=40%
Percentage if nickel=(to be calculated)

To find out the amount of nickel
Firstly, we have to find out the percentage of nickel:
percentage of copper+percentage of zinc
30% + 40% = 70%
percentage of nickel = 100% - 70%
percentage of nickel = 30%
To find out the amount of nickel:
30% of 20 kg
30
----- × 20
100
=6kg
=Amount of nickel is 6kg.
HOPE THIS HELPS!!!