how much 100% fire-fighting foam concentrate must be added to 1000 L of a 2.0% solution to make a 4.0% solution
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100% FFFoam means its completely FFF.
Amount of FFF in 1000 Litres of 2.0% solution = 1000 * 2/100 = 20 litres
Concentration of FFF when X Litres added to 1000 Litrers of 2.0% solution :
=> (20 + X) / (1000 + X) = 4.0% = 4 / 100 = 1/25
=> 25(20+X) = 1000 + X
=> 25 X + 500 = 1000 + X X = 500/24 = 20.83 litres
Amount of FFF in 1000 Litres of 2.0% solution = 1000 * 2/100 = 20 litres
Concentration of FFF when X Litres added to 1000 Litrers of 2.0% solution :
=> (20 + X) / (1000 + X) = 4.0% = 4 / 100 = 1/25
=> 25(20+X) = 1000 + X
=> 25 X + 500 = 1000 + X X = 500/24 = 20.83 litres
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