3 x 10^6
Shouldn't be too hard for ya ;)
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:

Solving for x:

Finally we obtain that 87.5mL of water should be used for 250g of plaster.
Answer:
<em>12.99</em>
Step-by-step explanation:
<em>a²+b²=c²</em>
<em>a²+b²=c²√91²+√78²=c²</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²91+78=c²</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²91+78=c²169=c²</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²91+78=c²169=c²c=√169</em>
<em>a²+b²=c²√91²+√78²=c²√8281+√6084=c²91+78=c²169=c²c=√169 =13</em>