A faulty gauge on a fire engine pump caused the apparent pressure in the hose to change

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A faulty gauge on a fire engine pump caused the apparent pressure in the hose to change every few seconds. The pressures (in lb/in.2) above and below the set pressure were recorded as: +7,−2,−9,−6. What was the change between 

(a) The first two readings, 

(b) Between the middle two readings

(c) The last two readings?

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Basic Technical Mathematics

ISBN: 9780137529896

12th Edition

Authors: Allyn J. Washington, Richard Evans

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