The barometer pressure in Manila dropped 6 millibars (mb); then it rose 3 mb. After that, it dropped 14 mb and then rose 4 mb. What was the total change in pressure?
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Answer:
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Given: The barometer pressure in Manila dropped 6 millibars (mb); then it rose 3 mb. After that, it dropped 14 mb and then rose 4 mb.
To find: The total change in pressure.
Solution:
Let the pressure measured by the barometer originally be equal to x. When it drops by 6 mb, the pressure changes to (x-6) mb. Then, it rises 3 mb and the pressure changes to (x-6+3) mb which is (x-3) mb.
After that, when it drops 14 mb, the pressure becomes (x-3-14) mb which is (x-17) mb. Then, it rises 4 mb and the pressure becomes (x-17+4) mb which is (x-13) mb.
The barometer initially measured the pressure as x mb and now, it is (x-13) mb. So, the pressure has dropped by 13 mb.
Therefore, the total change in pressure is 13 mb.