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Really Need Some Math Help for a Recipe

I have a recipe for choux paste that makes 2905 grams of dough. I need to make 1000 gm (1 kilo) of dough.

Ingredients

Water 1000 g
Salt 5 g
Shortening 300 g
Bread Flour 300 g
Pastry Flour 300 g
Whole Eggs 1000 g
Total 2905

I am totally incapable of doing this. Why? Don't know. Should I try to figure it out to 3000 gm then divide by 3 ...?

This is for a baking test I'm doing so I have to be right. I'd appreciate the help.

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    1. re: mcel215

      Thanks it's a good site. I'm not trying to convert from anything into anything though, just don't know how to do the math.

      1. re: RuralDeb

        I hear ya, Deb. Math is like a foreign language to me also. ;)

    2. To do it exactly, you'd divide 1000 by 2905. That is 0.34.
      Then multiply each ingredient by 0.34. For instance, 300 grams multiplied by 0.34 is 102 grams.

      3 Replies
      1. re: blue room

        Exactly! So grateful for your help. I really admire people who can figure out numbers - it just doesn't make any sense to me unless it's laid out like you did.

        Thanks!

          1. re: petitgateau

            You are very welcome, it's my go to site when I am a bit challenged, lol!

      2. If you own an iTouch or iPhone, the Ratio app does all the math for you!

        2 Replies
        1. re: smtucker

          Hey that's neat!
          Here's a demo:
          http://ruhlman.com/2010/07/ratio-app-...

          Now all I need is a touch-phone gizmo thingy--Gawd I'm old and out-of-touch!

        2. No, divide 1000/2905 (= .3440234) and multiply each of your ingredients by that number.
          Here's your ingredient totals:

          Water 344 g
          Salt 1.75 g
          Shortening 103 g
          Bread Flour 103 g
          Pastry Flour 103 g
          Whole Eggs 344 g
          Total 998.75

          Is about as close as you're going to get.

          1 Reply
          1. re: todao

            Everyone's been great. todao, math is your thing! I am so happy to learn about the app,, the demo is great and I just have to figure out how to afford it!