Based on the quantity of the sulfuric acid solution, the number of liters that should be mixed to produce a 30% solution is 2.4 liters.
Assume the quantity we are looking for is x. The formula to find it would then be:
40% × x + 24 % x the 4 liter solution = 30% of (4 liters + x liters)
0.4x + 0.96 = 0.3x + 1.2
0.4x - 0.3x = 1.2 - 0.96
0.1x = 0.24
x = 0.24 / 0.1
= 2.4 liters
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