constraint problem

Project Description:

a company makes two products in the quantities x1 and x2. they require that at least 20 of each be produced. which set of lower bound constraints reflects this requirement?
answer

x1 ≥ 20, x2 ≥ 20

x1 ≥ 20, x2 ≥ 20, x1 + x2 ≥ 40

x1 + x2 ≥ 40

x1 + x2 ≥ 20
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Price Type: Negotiable

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