Answer these based on the figure which represents the flow of natural gas through pipelines across major cities A, B, C, D and (in suitable units).Assume, that supply equals demand.
Number of inputs at B = $$1200$$
Number of outputs from B = $$550+250=800$$
Now, input - output = demand
=> Number of units demanded in B = $$1200-800=400$$
=> Ans - (A)
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