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Old 06-07-2005, 09:56 PM   #1
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What's The Problem - #3

OVERVIEW of PROBLEM: Converting flour weight to volume in a bread recipe

Consul had a good observation in Problem #2 about flour weight VS. volume. So - let's play with it!

The generally accepted correct way to measure flour is to use a dry ingredient measuring cup ... use a spoon to lightly sprinkle the flour into the measuing cup until it overflows, then level it off by running a straight-edge across it. No dipping the measuring cup into the flour, and no tapping, shaking or thumping the cup to level it off! This is normally the way flour is measured in a recipe unless otherwise stated - such as in Cookwise by Shirley Corriher (see Measuring on page 11).

ASSUMPTIONS: We need to make a few assumptions here to try to avoid me leading someone off in the wrong direction this time.

1. We are using US standard weights and measures ... 1 Cup = 16 Tablespoons, 1 pound = 16 ounces, and standard 5 lb bags of flour which are labeled 5-lbs - 80 ounces - 2.26 kg (2.26 kg is actually 2268 grams).

2. The moisture content of the flour is NOT a factor. Neither is if the bag says "Pre Sifted".

3. Using the standard method of measuring flour (above) - you will be within +/- 0.02 ounce by weight per 1 Cup of flour.

4. The "serving size" information on the side of the bag is correct for US measurements (cups, spoons) and only an approximate for the metric weight conversion due to rounding errors.


HELP: You shouldn't need anything more than a simple calculator (paper and pencil also works) but here is a site that will help you with conversions if you need them: http://www.onlineconversion.com



THE PROBLEM:

You have a bread recipe that lists volumes for everything but the bread and wheat flour - and those are given in pounds and ounces .. and you don't have any scales. What to do?

The recipe calls for
1-lb 1-oz Bread flour
1-lb 2-oz Wheat flour

You've got a 5-lb bag of each ... and while you scratch your head you read the information on the side of each bag.

BREAD FLOUR: A serving size is 1/4 cup (30g) - and there are 75 servings per 5-lb bag.

WHEAT FLOUR: A serving size is 3-Tablespoons (31g)- and there are 72 servings per 5-lb bag.

Rounded to the nearest quarter-cup - how many cups of bread flour and wheat flour do you need?

BONUS POINTS: How did you calculate your answer?

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Old 06-08-2005, 12:59 AM   #2
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I'm gonna cheat and call my friend Michael in FW - be right back
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Old 06-08-2005, 01:51 AM   #3
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Quote:
Originally Posted by kitchenelf
I'm gonna cheat and call my friend Michael in FW - be right back
Oh - come on Elf - it's not that hard if you think about it. Really no harder than: If Andy has 5 pennies and the elfen one has twice as many ... how many times can Elf throw in her 2-Cents worth?
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Old 06-08-2005, 05:27 AM   #4
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Michael,
This may be too simple an answer, but I tried not to read too much into all of the information you gave us.
I am really guessing, but since 1lb. 1 oz = 17 ounces. I am saying 2 cups 1 tbsp. of bread flour

1lb 2 oz = 18 oz. so it would be 2 cups plus 2 tbsp. of wheat flour.

Is it more complicated than that?

Used a pencil and paper. Could have figured it out in my head though.
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Old 06-08-2005, 09:22 AM   #5
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Old 06-08-2005, 09:28 PM   #6
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lyndalou - yep, it's a little more complicated than that!

The problem is to figure out the difference between volume and weight - what volume will equal what weight. It appears that you assumed weight and volume were the same ... 1 Cup (8-oz volume) of flour is equal to 8-oz by weight.

Andy got it wrong last night .... but after I pointed him in the right direction he got it right this morning. So, trying to not give the answer away, I'll just say that the information you need to solve the problem is on the side of the bags.
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Old 06-09-2005, 02:06 AM   #7
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hmmm. Still trying to figure it out.
I never did well in word/geometry problems.
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Old 06-09-2005, 02:21 AM   #8
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Don't feel bad - I never did figure out how the answer to 2X = 3Y wound up being 4!
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Old 06-09-2005, 02:27 AM   #9
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Funny how we don't think we need science or math, then we grow up and cook, and we need to utilize both!
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Old 06-09-2005, 05:12 AM   #10
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Oh, gosh. you're right Michael, that is what I did. I'll try one more time, probably take me hours, math is not my strong suite. Do I actually have to have a bag of wheat flour? I'll check the bag in the market when I go later.
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