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30 March, 19:06

If 45 mL of H2O are required to mix 100 g of casting plaster, how many milliliters would you need for 250 g of plaster?

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  1. 30 March, 20:24
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    Answer is 112.5 mL

    You add 45 and another 45 to get 90 mL for 200g, and divide 45 by 2 to get 22.5 for the 50g left and you add all up 90+22.5=112.5
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