angela is designing a plumbing system for a new office building three pipes, a, b and c

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Question:

angela is designing a plumbing system for a new office building three pipes, a, b and c enter the building from the main water line the total flow in all three pipes is 100 galmin if pipes b and c together carry 40 galmin and pipe a carries twice as much water as pipe b, how much water must flow in each pipe