math in distress

If a textbook weighs 2 1/2 pounds and the notebook weighs 4 ounces. You bought 5 textbooks and and 5 notebooks what is the total weight in pounds?

2.5 pds 4 oz 12 1/2
*5 textbooks *5 + 20 oz
___ ____ __________
12 1/2 20 oz

I'm confused after that. Pleeeaase help!

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  1. one book weighs 2.5 lbs
    so 5 books weigh 5(2.5) or 12.5 lbs

    one notebook weighs 4 ounces
    5 notebooks weigh 20 ounces
    = 1 lbs and 4 ounces , (if I recall the non-metric stuff)

    total = 12.5 lbs + 1 lb + 4 ounces, you were correct here
    = 13.5 lbs + .25 lbs
    = 13.75 lbs or 13 lbs and 12 ounces

    (shows why the US just has to go metric )

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  2. Metric spoils all the fun.
    Remember:
    1 slug = 1 pound/g = (1/32.174049)pounds on the surface of earth only.

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  3. Why, Damon, I'm surprised! You never seem to miss a chance at poking fun at English units.

    And I (sort of) like all the strange units, just as I miss the old English coinage.

    That's weird, if the slug is defined in terms of pounds, and not the other way around. Guess it's all relative...

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  4. LOL, English units bother me almost as much as the confusion between bearing and heading in mathematics texts :)

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