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29 votes
29 votes
To mix plaster for a dental model, 35 mL of water is used for 100g of plaster. How many mL of water should be used for 250g of plaster? Round your final answer to 1 decimal place if necessary.

User Haxhi
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1 Answer

14 votes
14 votes

Okay, here we have this:

Considering the provided information, we are going to calculate the requested value, so we obtain the following rule of three:


\begin{gathered} \frac{x}{35mL\text{ of water}}=\frac{250g\text{ of plaster}}{100g\text{ of plaster}} \\ x=\frac{250g\text{ of plaster}}{100g\text{ of plaster}}\cdot35mL\text{ of water} \end{gathered}

Solving for x:


\begin{gathered} x=2.5\cdot35mL\text{ of water} \\ x=87.5mL\text{ of water} \end{gathered}

Finally we obtain that 87.5mL of water should be used for 250g of plaster.

User Bathyscapher
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