Question

Gunpowder contains 75%nitre and 10%sulphur find the amount of gunpowder which carries 9kg nitre. What amount of gunpowder would contain 2.5kg
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Answer 1

Percentage of nitre in gunpowder = 75%

Amount of nitre in gunpowder = 9 kg

Let us consider the amount of gunpowder be ‘x’ kg

So, by calculating (x/100) × 75 = 9

By cross multiplying x/100 = 9/75 x = (9×100)/75 = 12kg

Percentage of sulphur in gunpowder = 10%

Amount of sulphur in gunpowder = 2.3 kg

Let us consider amount of gunpowder be ‘x’ kg So, by calculating (x/100) × 10 = 2.3

By cross multiplying x/100 = 2.3/10 x = (2.3×100)/10 = 23kg

∴ The amount of gunpowder in nitre is 12kg The amount of gunpowder in sulphur is 23kg

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Answer 2

•: The amount of gunpowder containing 9 kg nitre is 12 kg.