Calculation help?

[yellowjellybean]

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Can some explain this to me? Especially where the 1.9 comes from

31.25% of 760 = 76 + 76 + 76 +7.6 + 1.9 = 237.5 torr

I've seen this shortcut used throughout TBR books but don't really understand it. Thanks.

 

[Postictal Raiden]

Can some explain this to me? Especially where the 1.9 comes from

31.25% of 760 = 76 + 76 + 76 +7.6 + 1.9 = 237.5 torr

I've seen this shortcut used throughout TBR books but don't really understand it. Thanks.

the 0.25% of the 31.25%.

This level of accuracy is never needed on the mcat though. I would imagine to answer this you would be required to know that the answer is close to 250 (1/3 of 760).