Please help...........
Suppose we start with unlimited supplies of a 20% h2so4 solution and of a 50% h2so4 solution. We combine x liters of the first with y liters of the second to produce 7 liters of a 40% h2so4 solution. What does x equal?

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work in masses of pure sulphuric acid
the mass of acid in 40% solution is 7 * 10 * 40 = 2800g

2.8?

x liters of 20% contains 200x g
y liters of 50% = 500y g

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