Answer to Question #32658 in Other Math for amit kumar
x * 0.75 = 9
x = 9 / 0.75
x = 12.
Hence 12 kg gunpowder carries 9 kg nitre.
Let y kg be the amount of gunpowder which contains 2.5 kg sulfur. As gunpowder contains 10% sulfur we obtain:
y * 0.1 = 2.5
y = 25.
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