Question

Math help please. I know this is a system of equations, but am not sure to go about how setting the problem up.

Answer 1

This method is incorrect. I wrote in the question that this is a system of equations.

Answer 2

let x ml of 70 % alcohol be added to 45 ml of 10 % alcohol to make (x+45) ml of 65 % alcohol.
70 %=0.7
10%=0.1
65%=0.65
0.7x+0.1*45=0.65(x+45)
multiply by 100
70x+450=65(x+45)
70x+450=65x+65 *45
70x-65x=65*45-450
5x=45(65-10)
5x=65*55
\[x=\frac{ 45\times 55 }{ 5 }=45\times11=495~ml\]

Answer 3

thanks

Answer 4

yw