Three oil pumps fill three different tanks. The pumping rates of the pumps (in L/h) are r₁, r₂,  and r₃, respectively. Because of malfunctions, they do not operate at capacity each time. Their rates can be found by solving the following system of equations:

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n + 2 + 3 12 r₁ + 2r₂ = 13,000 3ri + 3rz + 2r3 = 36,000 - 14,000