Question

Gunpowder contains 75 %nitre, 15%charcoal and the rest is Sulphur. Find the total weight of charcoal and Sulphur in 3kg of gunpowder.

Answer 1

Charcoal = 15%

Nitre = 75%

Sulphur = 100 -(75+15)

100-90

10%

Weight of charcoal in 3kg of gun powder = 3000*15/100

= 450g

Weight of sulphur in 3kg of gun powder = 3000*10/100

300g.

Hope this will help you.

Answer 2

let the amount of sulphur beX in 9 kg of gun powder

contents of gun powder=75%+15%+X

=90%+X

therefore, 9kg of gun powder = 90/100 + X

thus,X = 9×100/90 =10

therefore the amount of sulphur in 9kg of gun powder is 10%